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November 07, 2005

Simple Flex Tutorial

I've been learning Flex for a presentation at my local CFUG, and I'm actually quite impressed with how much you can do with so little code.

However, most of the Flex tutorials I have found are very long and over simplified, so I've created a simple blog reader in 23 lines of MXML code to use as a tutorial. Here's what our Flex Application will look like:

How does the example work?

When you click the Load Blog Entries button my RSS feed entries are loaded into the datagrid. When you click on a row in the datagrid the corresponding entry is loaded into the text area.

Step 1 - XML and Application declaration

Start your XML file with a XML declaration, and an mx:Application tag:

<?xml version="1.0" ?>

<mx:Application xmlns:mx="http://www.macromedia.com/2003/mxml">

Step 2 - Define your HTTPService

Our first step is to define the HTTPService that we will use to connect to my RSS feed. We will give an id of httpRSS so we can refer back to it.

<mx:HTTPService id="httpRSS" url="http://www.petefreitag.com/rss/" resultFormat="object" />

Step 3 - Enclose your controls within a panel

A panel is simply a container to put controls (the DataGrid, TextArea, and Button) into. We are going to set some attributes on the panel as well, it should be pretty easy to figure out what they mean:

<mx:Panel id="reader" title="Pete Freitag's Blog Reader" width="500">

Step 4 - Define your DataGrid

We are using the DataGrid component to display the list of blog entries in my RSS feed, along with their date.

This step is probably the most complicated step because we have to bind our RSS xml data to the datagrid, and define an event handler when the rows are clicked.

In the attributes of the DataGrid we are using dynamic variables or expressions denoted by the curly braces {variable}.

<mx:DataGrid id="entries" width="{reader.width-15}" dataProvider="{httpRSS.result.rss.channel.item}" cellPress="{body.htmlText=httpRSS.result.rss.channel.item[entries.selectedIndex].description}">
  <mx:columns>
    <mx:Array>
      <mx:DataGridColumn columnName="title" headerText="Title" />
      <mx:DataGridColumn columnName="pubDate" headerText="Date" />
    </mx:Array>
  </mx:columns>	
</mx:DataGrid>

Ok so there is a lot going on there, first so I'll break it down a bit:

width

We are setting the width dynamically based on the size of its parent panel reader, specifically we set it to be 15 pixels narrower than its panel.

dataProvider

In the dataProvider attribute we are binding the data for this grid to the result of our HTTPService named httpRSS. More specifically we want to bind each item tag in our XML file to a row in the datagrid. Since the item tags are inside the rss and channel tags we refer to it the array of items as httpRSS.result.rss.channel.item.

cellPress

Next we want to create an event handler that will display the contents of the description tag inside the item that is clicked on. Using the variable entries.selectedIndex we know which item was clicked on, and we can refer to the description (the entry body) of that item as: httpRSS.result.rss.channel.item[entries.selectedIndex].description.

Now we just need to set the value of our TextArea which we will define in the next step to the rss item description, so we simply assign that value to the htmlText property of the TextArea (whose name will be body).

columns

Now we need to define which columns we are to display in the datagrid. The columnName must match the tag name that we want it to correspond to.

Step 5 - Define the TextArea

Use the mx:TextArea tag to define the text area where the entry body will go:

<mx:TextArea id="body" editable="false" width="{reader.width-15}" height="300" />

Step 6 - Create a Button

Our last control to define is a Button which will simply tell the HTTPService to make the request.

<mx:Button label="Load Blog Entries" click="{httpRSS.send()}" />

In the click event handler we call the send() method on our HTTPService object.

Step 7 - Close Panel and Application

Simply close some tags, and your done!

</mx:Panel>
</mx:Application>

One Caveat

Flex 1.5 uses a proxy to invoke HTTPService calls, and other remote service calls, and for security reasons the proxy will block the HTTP call. You add the RSS feed url (or simply http://*) to the proxy whitelist in your flex-config.xml. See this KB article for more info.

Complete MXML source code:

<?xml version="1.0" ?>

<mx:Application xmlns:mx="http://www.macromedia.com/2003/mxml">

 <mx:HTTPService id="httpRSS" url="http://www.petefreitag.com/rss/" resultFormat="object" />

 <mx:Panel id="reader" title="Pete Freitag's Blog Reader" width="500">

  <mx:DataGrid id="entries" width="{reader.width-15}" dataProvider="{httpRSS.result.rss.channel.item}" cellPress="{body.htmlText=httpRSS.result.rss.channel.item[entries.selectedIndex].description}">
    <mx:columns>
      <mx:Array>
        <mx:DataGridColumn columnName="title" headerText="Title" />
        <mx:DataGridColumn columnName="pubDate" headerText="Date" />
      </mx:Array>
    </mx:columns>	
  </mx:DataGrid>

  <mx:TextArea id="body" editable="false" width="{reader.width-15}" height="300" />

  <mx:Button label="Load Blog Entries" click="{httpRSS.send()}" />
  
 </mx:Panel>
</mx:Application>

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Comments

On 11/07/2005 at 4:46:58 PM MST Doug Cain wrote:

When I compile the MXML in your example it takes exception to the applicaion line:

<mx:Application xmlns:mx="http://www.macromedia.com/2003/mxml">

I think it should read:

<mx:Application xmlns:mx="http://www.macromedia.com/2005/mxml">

On 11/07/2005 at 5:08:54 PM MST Pete Freitag wrote:

Doug, Are you running this on Flex 1.5 or Flex 2.0, I have tested this on 1.5 but not Flex 2.0

On 11/07/2005 at 6:02:11 PM MST Scott Fitchet wrote:

Nice job, Pete ...

On 11/08/2005 at 7:57:02 PM MST Sho Kuwamoto wrote:

To make this work in the Flex 2.0 alpha:

1) Modify the namespace URL as suggested above.

2) Change the two places where "{reader.width-15}" occurs to "100%", as the data binding expressions cause unwanted scrollbars to appear in the alpha.

On 11/08/2005 at 9:03:11 PM MST Pete Freitag wrote:

Thanks Scott, and thanks for the tips Sho!

On 11/14/2005 at 11:16:59 AM MST mojo wrote:

Nice job... I'm trying to make this work in the Flex 2.0 Alpha, but if I change the url rss, with some others (ex. http://rss.macgeneration.com/), it give me an error "Security error accessing url" ! How doing it?

On 12/05/2005 at 12:35:44 AM MST gaurav wrote:

Can show an example to convert an .aspx page to Flex

On 02/07/2006 at 8:16:01 PM MST flexdummy wrote:

Can u show sample on hw 2 pass variable on the mxml page to ASP page to retrieve the value

On 02/24/2006 at 9:35:04 AM MST vesa wrote:

Hi Pete, I know you are busy with stuff but I get errors with this one when using Flex 2.0 Beta.. I did what Sho told to do and I get this error:

"TypeError: Error #1010: undefined has no properties. at Peter/__entries_cellPress() at flash.events::EventDispatcher/dispatchEvent() at mx.core::UIComponent/dispatchReplayableInteraction() at mx.controls::DataGrid/mouseDownHandler() "

After that It will work,strange..

On 04/05/2006 at 3:02:49 AM MDT John Henry wrote:

Hi everyone. I guess no one has posted on this in a while but...

I've noticed that there have been a few changes in the Flex 2.0 Beta since the last build that affect this application.

#1: Everyone is probably already aware that the default namespace has changed again after Adobe's acquisitionof Macromedia. It is now "http://www.adobe.com/2006/mxml"

#2: The "cellPress" is replaced by the "click" property.

#3: The "columnName" property is replaced by the "dataField" property.

If you make changes to the code accordingly, it will run in the current build.

Finally much thanks to you Mr. Freitag. Your site is a wonderful resource for learning.

On 05/11/2006 at 6:50:48 AM MDT Kees wrote:

Hmm I'm using flex builder 2.0 beta 3 and I get the following errors:

Design mode: Error updating attributes for item DataGrid "entries". Cannot resolve attribute 'columnName' for component type mx.controls.dataGridClasses.DataGridColumn. Cannot resolve attribute 'columnName' for component type mx.controls.dataGridClasses.DataGridColumn. Cannot resolve attribute 'cellPress' for component type mx.controls.DataGrid.

Does anyone know how to fix these problems?

grtz

On 05/15/2006 at 4:00:17 AM MDT Nathan wrote:

Hey grtz,

Do u read stuf, or just post???

Read the previous post and u will see that you need to change the columnName property to dataField and cellPress to click.

Duh...

On 05/16/2006 at 8:29:55 AM MDT Pete wrote:

I've made some adjustments but it won't work in flex 2...

<?xml version="1.0" encoding="utf-8"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" width="100%" height="100%"> <mx:HTTPService id="RSSfeed" url="http://www.petefreitag.com/rss/" resultFormat="object" />

<mx:Panel width="372" height="330" layout="absolute" horizontalCenter="0" verticalCenter="-37.5" title="XML lezen"> <mx:DataGrid x="28" y="10" width="296" id="entries" dataProvider="{RSSfeed.result.rss.channel.item}" click="{body.htmlText=RSSfeed.result.rss.channel.item[entries.selectedIndex].description}"> <mx:columns> <mx:DataGridColumn dataField="title" headerText="Titel"/> <mx:DataGridColumn dataField="pubDate" headerText="Datum"/> </mx:columns> </mx:DataGrid> <mx:TextArea x="28" y="160" width="296" height="90" id="body" /> <mx:Button x="143" y="258" label="Check" click="{RSSfeed.send()}"/> </mx:Panel> </mx:Application>

Can anyone help me? Thnx in advance!

On 05/16/2006 at 9:06:30 AM MDT Bla wrote:

The result needs to be lastResult. This would work in flex 2:

<?xml version="1.0" encoding="utf-8"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" width="100%" height="100%" horizontalAlign="center" verticalAlign="middle"> <mx:HTTPService showBusyCursor="true" id="RSSfeed" url="http://www.petefreitag.com/rss/" resultFormat="object" />

<mx:Panel width="372" height="330" layout="absolute" horizontalCenter="0" verticalCenter="-18.5" resizeEffect="Resize" title="XML lezen"> <mx:DataGrid width="296" id="entries" dataProvider="{RSSfeed.lastResult.rss.channel.item}" click="{body.htmlText=RSSfeed.lastResult.rss.channel.item[entries.selectedIndex].description}" horizontalCenter="0" verticalCenter="-64"> <mx:columns> <mx:DataGridColumn dataField="pubDate" headerText="Datum"/> <mx:DataGridColumn dataField="title" headerText="Titel"/> </mx:columns> </mx:DataGrid> <mx:TextArea width="296" height="90" id="body" verticalCenter="60" horizontalCenter="0"/> <mx:Button toolTip="Haal recente rss feed binnen" label="Check" click="RSSfeed.send()" verticalCenter="124" horizontalCenter="0"/> </mx:Panel> </mx:Application>

On 06/29/2006 at 1:04:24 AM MDT Nac wrote:

Thanks for the sample. I got it working nicely with 2.0, and PHP.

aka flex newb

On 07/10/2006 at 2:55:09 PM MDT doc_x wrote:

Thank you for this example.. I would also love to see an example of accessing an MSAcess or MSSql database via an ASP page...

On 07/18/2006 at 10:33:46 AM MDT tester wrote:

Macromedia Sucks, They doesnt care about their users I have spend hours learning Flex 1.5 and now none of my projects works in flex 2. They simply change a lot. They doesnt care, they just did it. I would like an Open Source tool to rivalize with Flewx and flash and so on, they have the monoopoly and that is not good for anybody

On 07/26/2006 at 9:29:29 PM MDT Welly wrote:

About Macromedia Sucks... Well the big job was done by Adobe, who finally buy Macromedia.

On 10/10/2006 at 9:29:04 PM MDT Sam wrote:

Hi Pete,

I would like to have a simple Contact Manager Application written in Flex and Coldfusion backend MSSQL or MSAccess database.

I would like you to help me develop this application. Please contact me via email and we could discuss more and price.

On 11/08/2006 at 3:24:00 AM MST Ron wrote:

Hey Pete, Could you put up some more interesting examples? I found this similar exercise in the Adobe tutorials too.

On 11/29/2006 at 8:24:27 AM MST Matze wrote:

Hello Mr. Freitag,

I have a problem in flex and hope that you or anybody else can help us.

I have a problem with the MenuBar and a question to delete a component out of storage.

1. We have implemented the MenuBar, which was filled dynamically with XML data.

Sporadically it will appear following fault, if we "mousover" the root layer.

RangeError: Error #2006: Der angegebene Index liegt außerhalb des zulässigen Bereichs. at flash.display::DisplayObjectContainer/addChildAt() at mx.managers::SystemManager/http://www.adobe.com/2006/flex/mx/internal::rawChildren_addChildAt() at mx.managers::SystemManager/addChild() at mx.managers::PopUpManager$/addPopUp() at mx.controls::Menu/show() at mx.controls::MenuBar/::showMenu() at mx.controls::MenuBar/::mouseOverHandler()

Here a abrid ged version of our XML to create the MenuBar:

It is a well-formed XML.

2. Delete a component out of storage We have some own components (basically forms), which will be created and shown by an construct e.g. var myComponent : T_Component = new T_Component ; this.addChild(myComponent)

Some of our forms will be created in an popup. On every call of the popup, we lost 5 mb or more, all childs on the windows will be removed by formname.removeAllChild(); What cann we do, that the garbage collector will dispose this objects. Is there a way to show all objects with references (NOT NULL)?

I have read in the Flex Help, that this.removeChild(myComponent) not delete the form and/or object out of the storage. Rather the object must be destroyed.

It is sufficient to call delete(myComponent) about remove this object out of the storage as the case may be that the garbage-collector remove this object at any time? Or how can I destroy a component correctly. What happens with the widgets on this component e.g. input fields or datagrids? Are they also being deleted?

Thanks for your help.

Matze

On 12/07/2006 at 11:02:25 PM MST nithya wrote:

i am new to flex?

plz can u let me know about flex?

On 01/19/2007 at 11:04:33 PM MST lekha wrote:

i am new to flex?plz can u let me know about flex?

On 01/24/2007 at 2:59:43 AM MST ankit mittal wrote:

i am working on flex 2, i made an mxml application with some cutom controls added to the library but it is not showing me the controls on design mode when added. however when we run it the controls are shown fine. in design mode it gives the error Design mode: Error updating attributes for item MstrGauge. please suggest me some thing

On 01/26/2007 at 11:04:18 AM MST Andre wrote:

I have a question. I put the code that bla say, and i changed the url to http://exameinformatica.clix.pt/rss/?output=rss i can't it read that? sorry, if i have any error but i'm not english.

On 04/02/2007 at 11:23:00 PM MDT steven wrote:

I want to ask how to use the httpservice works. I mean what if i want to get data from a local file? I'm sorry if the question seem stupid but i am new to this. can you put something like a localhost in the parameters of httpservice?

On 04/03/2007 at 4:49:24 AM MDT Balasubramanian wrote:

How to put navigation bar using mxml,i'm new to flex.

On 05/01/2007 at 2:27:40 AM MDT Flexer111 wrote:

hi@all is it posible to build a search engine to scan the xml or Rss file?

On 05/11/2007 at 12:30:44 AM MDT Bali wrote:

Hi Can we use this thing in php

if yes, how can

bali http://www.developnew.com

On 05/11/2007 at 6:32:12 AM MDT KMJ wrote:

Hi, i am a newb 2 dis. cld anybody plz suggest me with links that have good flex tutorials? Thanks in advance.

On 06/22/2007 at 2:55:27 AM MDT ASP wrote:

After converting above example to Flex 2 I am getting the following error.

1119: Access of possibly undefined property result through a reference with static type mx.rpc.http.mxml:HTTPService.

Plz guide as I am a newB.

On 07/03/2007 at 10:51:32 PM MDT Aysha wrote:

how can i bind the data of DataGrid row on the Onclick event to the column chart in Flex 2.0 pls tell me

On 07/11/2007 at 8:16:56 AM MDT Ritesh wrote:

ASP: change the result to lastResult and it'll work..good luck

On 08/24/2007 at 2:33:50 AM MDT Balaji wrote:

Hi,,,I need to connect the flex in the mysql,,, dont know how to connect,,, can any one help me,. for connecting with database...

On 08/30/2007 at 4:26:53 PM MDT Pj wrote:

I use a php file to translate my Mysql to Xml $Query = "SELECT * from flex"; $Result = mysql_query( $Query ); $Return = "<pjflex>"; while ( $Flex = mysql_fetch_object( $Result ) ) { $Return .= "<flex> <1>".$Flex->flex_id."</1> <2>".$Flex->flex_id."</2> <3>".$Flex->flex_id."</3> <4>".$Flex->flex_id."</5> <5>".$Flex->flex_id."</5> </flex>"; } $Return .= "</pjflex>"; the numbers are just chosen XML tags flex_id = = the name you have it in Flex and for storing it in an datafield <mx:HTTPService url="XML.php" id="myData" showBusyCursor="true" useProxy="false"/> <mx:Panel width="562" height="417" layout="absolute"> <mx:DataGrid x="10" y="10" width="522" height="357" dataProvider="{myData.lastResult.pjflex.flex} " > <mx:columns> <mx:DataGridColumn headerText="name" dataField="1" sortDescending="true" width="30"/> <mx:DataGridColumn headerText="name" dataField="2" width="50"/> <mx:DataGridColumn headerText="name" dataField="3"/> <mx:DataGridColumn headerText="name" dataField="4"/> <mx:DataGridColumn headerText="name" dataField="5"/> you have to chose the name ofcourse myData.lastResult.pjflex.flex this a the hierarchy of my XML file pjflex > flex but this is not nessesairy. hope this helps

On 10/03/2007 at 7:48:11 PM MDT Lee wrote:

A full body x-ray scan is an effective method of maintaining a high level of security

On 10/04/2007 at 9:39:38 PM MDT Alan Garcia wrote:

Hello all,

I hae two weeks to build out a report module to a Flex 2.0 project using ColdFusion and MSSQL as a backend.

Up until now, I've only worked with PHP and Rails (both using MySQL).

The report is a little intense, but it is in a spreadsheet format. Are there any recommendations in terms of tutorials on built-in report features in Flex 2.0 as well as export functionality to different office/adobe document formats?

On 10/11/2007 at 8:41:55 AM MDT ibitus wrote:

Hi Pete, thank you for this nice Reader!

Some RSS-Feeds are working fine and some bring the Error-Message: [RPC Fault faultString="Security error accessing url" faultCode="Channel.Security.Error" faultDetail="Destination: DefaultHTTP"] at mx.rpc::AbstractInvoker/http://www.adobe.com/2006/flex/mx/internal::faultHandler() at mx.rpc::Responder/fault() at mx.rpc::AsyncRequest/fault() at ::DirectHTTPMessageResponder/securityErrorHandler() at flash.events::EventDispatcher/flash.events:EventDispatcher::dispatchEventFunction() at flash.events::EventDispatcher/dispatchEvent() at flash.net::URLLoader/flash.net:URLLoader::redirectEvent()

What is going wrong ?

On 10/22/2007 at 11:08:19 AM MDT manisha wrote:

HI, I had tried that above example and made changes as Click and DataField too. But still I am getting this error "1119: Access of possibly undefined property result through a reference with static type mx.rpc.http.mxml:HTTPService. testing/src testing.mxml"

Pls anyone can explain me...

On 11/12/2007 at 3:54:51 AM MST Balaji wrote:

Hi all hope all doing well in flex... i am doing the connectivity for Mysql through webservice, i can able to get the data from database. now need to do the circle of Insert, edit, delete.. send me if anyone knows about this,,

On 12/17/2007 at 5:07:07 PM MST Don wrote:

Just installed Flex 3, tried out your code, got, Severity and Description Path Resource Location Creation Time Id Cannot resolve attribute 'columnName' for component type mx.controls.dataGridClasses.DataGridColumn. firstFlexApp/src firstFlexApp.mxml line 15 1197935559448 7

Looks like, cellPress and DataGridColumn are not defined? Any further idea?

Thanks.

On 01/08/2008 at 4:44:28 PM MST Emil wrote:

For those who got the 1119 error:

1119: Access of possibly undefined property result through a reference with static type mx.rpc.http.mxml:HTTPService.

Change: httpRSS.result to httpRSS.lastResult

in both occurrences.

On 01/18/2008 at 2:19:18 AM MST Touriste wrote:

cellPress may be replaced with itemFocusIn: http://livedocs.adobe.com/flex/2/langref/mx/controls/DataGrid.html#event:itemFocusIn

On 01/18/2008 at 2:59:44 AM MST touriste wrote:

My bad.. In fact, instead of using the cellPress property in the datagrid, you will use the selectedItem method in another controler. Here is the complete code (take a look a the DataGrid and the TextArea): <?xml version="1.0" ?>

<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">

<mx:HTTPService id="httpRSS" url="http://www.petefreitag.com/rss/" resultFormat="object" />

<mx:Panel id="reader" title="Pete Freitag's Blog Reader" width="500">

<mx:DataGrid id="entries" width="{reader.width-15}" dataProvider="{httpRSS.lastResult.rss.channel.item}"> <mx:columns> <mx:Array> <mx:DataGridColumn dataField="title" headerText="Title" /> <mx:DataGridColumn dataField="pubDate" headerText="Date" /> </mx:Array> </mx:columns> </mx:DataGrid>

<mx:TextArea id="body" editable="false" width="{reader.width-15}" height="300" htmlText="{entries.selectedItem.description}" />

<mx:Button label="Load Blog Entries" click="{httpRSS.send()}" /> </mx:Panel> </mx:Application>

nb: For flex3: - "http://www.macromedia.com/2003/mxml" became "http://www.adobe.com/2006/mxml" - "result" became "lastResult" - "cellPress" doesn't exist anymore (may be "itemClick" now)

nb2: To automatically, get the rss data when you load the page you can add a "completeCreation" paramater in the application tag: <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" creationComplete="{httpRSS.send()}" >

On 01/22/2008 at 7:34:52 PM MST anjaiah wrote:

please can you help me out from this issue: I want to flex(dataGrid) to mysql connection and get data from mysql for displaying on the dataGrid

On 01/24/2008 at 9:06:49 PM MST bangers xxx wrote:

Rural development is the main cause of wildfires

On 01/25/2008 at 8:47:08 AM MST Touriste wrote:

I think you should create a server to connect to your SQL database and then send data to your Flex client. that's the project I am doing.

try MySQL for you DB, Axis2 and Java for your server and maybe some SOAP for the transfert protocole :p

On 02/04/2008 at 1:23:03 PM MST Josh wrote:

Thanks for posting this. I am just learning Flex and it was super-helpful. A quick question though: is there a way to set the system to grab more results from the RSS than the 10 or so that it does currently? Thanks!

On 03/17/2008 at 3:22:59 AM MST MechanisM wrote:

I'm sorry, New in Flex.. So.. I wanna know how to autoload RSS content without using this button: <mx:Button label="Load Blog Entries" click="{httpRSS.send()}" /> hmmm??

On 03/18/2008 at 9:43:04 AM MST Anonymous wrote:

I wrote in my comment on 01/18/2008 at 2:59:44 AM MST

To automatically, get the rss data when you load the page you can add a "completeCreation" paramater in the application tag: <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" creationComplete="{httpRSS.send()}" >

On 04/14/2008 at 4:18:33 AM MDT Sid B wrote:

For the error "Security error accessing url", have a look at this thread:

http://www.iknowkungfoo.com/blog/index.cfm/2007/12/5/Security-error-accessing-url-problem-with-Flex-SWF

On 05/07/2008 at 3:26:13 PM MDT james wrote:

This tutorial is three years old. Does it still work??

On 05/11/2008 at 7:27:36 AM MDT Taran wrote:

------------------

On 10/11/2007 at 8:41:55 AM MDT ibitus wrote: 38 Hi Pete, thank you for this nice Reader! Some RSS-Feeds are working fine and some bring the Error-Message: [RPC Fault faultString="Security error accessing url" faultCode="Channel.Security.Error" faultDetail="Destination: DefaultHTTP"] at mx.rpc::AbstractInvoker/http://www.adobe.com/2006/flex/mx/internal::faultHandler() at mx.rpc::Responder/fault() at mx.rpc::AsyncRequest/fault() at ::DirectHTTPMessageResponder/securityErrorHandler() at flash.events::EventDispatcher/flash.events:EventDispatcher::dispatchEventFunction() at flash.events::EventDispatcher/dispatchEvent() at flash.net::URLLoader/flash.net:URLLoader::redirectEvent()

What is going wrong ? ---------------------------

I am also getting the same error.

My file runs fine when i run from Flex. but when i copy the folder to another location, it gives me this error. Any solutions??