Pardon the late reply.  This is often due to a corrupt DTA (metadata) file in one of your customs.  Unfortunately the only real way to root it out is to start over, then keep adding customs until you find which one breaks.  You can try the half rule where you add half your customs.  If you see the problem, start with half again (a quarter), or if you don’t see the problem, try the other half, and then so on until you’ve narrowed it to a specific file.  Then let the author of that custom know they put together a bad package.

Good luck!