I'm seeing some very strange errors popping up from STS that weren't showing the previous day when I shut down.

In the problems tabs, for several projects which have no errors the day before they are now showing with:
"chkj3008e missing or invalid war file" with a type of Validation Message. I've done some checking around the web and I can't find any clear answer as to whats going on and STS isn't giving me any further information then that error (which appears to be at the project level and I can't seem to trace it back to what WAR it's even referring to). It doesn't stop me from compiling and the compiled code deploys and runs correctly on my TC's.

I'd greatly appreciate any help that can be given and I'll provide any additional details that may help.