appError triggered on editor boot

After compiling my project today, it successfully compiles but then triggers a breakpoint with this error message:

UE4Editor.exe has triggered a breakpoint.

[2014.06.27-19.38.44:311][ 0]LogWindows:Error: appError called: Cast of FPSCharacter /Script/FPSMMO.Default__FPSCharacter to Level failed

[2014.06.27-19.38.44:312][ 0]LogWindows:Error: Windows GetLastError: The operation completed successfully. (0)

[2014.06.27-19.38.44:454][ 0]LogWindows: === Critical error: ===

FPSCharacter is a subclass of character if it matters.

Thank you and tell me if you need any other information.

EDIT: I am still using 4.0
EDIT: I tried using 4.2 to no avail.

Any ideas guys?

Sorry where do i find that? I’m a little new.

does this look like the right thing?

You are doing something unusual. Please post the stack of your crash, that should give more indication of where it is going wrong.

That log is somewhat helpful but not entirely. You must have a reference to FPSCharacter in a bad spot, possibly in your ini file. It’s trying to treat FPSCharacter as if it was a map and crashing, I do not know why it would do that, I have never seen an issue like this and there isn’t much we can help you with, you’ll have to investigate yourself.

After extensive experimentation, I found that the error came from trying to make a sub-object from a subclass of actor.