function exists but fire bug says not defined

I have a div on click , and function very well exisi开发者_运维百科ts in the file. I verified through firebug also , but still it says.

showPopUP is not defined

It was all working good , suddenly it stopped working.

any clues how to debug this issue. We did a file aggregation and all tha javascripts at the runtime are aggregated in one file. But this was all working good till yesterday.

The div click is jquery kind of click.

It's not lying. Check spelling (remembering that js is case sensitive) and check that the function declaration is in scope. If you can post a link to a demo page I'm sure we could quickly identify your problem.