I have been racking my brain trying to figure out why I kept getting this error:

"Element CACHE is undefined in APPPLICATION."

My first thought was that somehow the CACHE variable was being deleted from the application structure, somewhere in the code.

While working today I had to write an error message that a user would see if their session had timed out. I was tempted to write something like:

Sorry your session has expired please login again.

I recently did this:

<cfoutput query="#queryName#"> ... </cfoutput>

Can you spot the error?

I think that is probably a very common mistake - here's the error message you get in ColdFusion MX 6.