After a few mod updates I can no longer start a SSP world. The game doesn't crash (which is weird), just reports that "The state engine was in incorrect state ERRORED and forced into state SERVER_STOPPED. Errors may have been discarded." If I remove the mod, it doesn't crash.

Full log here: https://gist.github.com/iarspider/b290ba98204c3352790d (if that helps).

@iarspider Try the latest build from Jenkins first

Doesn't help.

One thing I've noticed that this error prevents the game from creating a proper save (i.e. crashed worlds doesn't appear in Singleplayer menu).

@hilburn Yup: if level.dat is damaged, the game won't recognize the save file. I've mentioned that since I thought it could help find the problem.

@iarspider Well that is very bad

@iarspider I also can't find any NER related exceptions thrown in your log

That's why it is "weird". The only thing that points at NER is this line:

neresources{0.1.0.76} [Not Enough Resources] (NotEnoughResources-1.7.10-0.1.0.76.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Errored->Errored

@iarspider that is a rather common bug with vanilla - the save will still be there but for some reason it's not recognised by minecraft - create a new world with the same name and it will open properly