Crash Report when I hit Play (new development)

Not sure what's going on.  For the last two days I have been able to play my Eastern Front Mod no problems.  This morning, when I hit play it gave me a crash report.  I can't imagine what changed between yesterday and this morning, but something obviously has.  Please help!  Bit of a newb, not sure what you might need from me but I will watch this thread closely.

You should uninstall EF and make sure all the files were wiped out, then reinstall it.