Updated yesterday and now I get this error:

http://imgur.com/C7OwxYe

I wont have access to my computer for a few days, but this might be a config issue or a mod incompatibility. Line 9 activates when there is an "assembling-machine-4", which should only activate when Bob Assembly is active and possibly also 5dims. If you have disabled the mini-assemblers in the config of mini machines mod, I didnt add a check if assembler existed, which could be the problem.

I would need to know if you changed mini machines config at all, and list of mods being used, please.

Figured out issue in private messages. Disabling mini assemblers in config while using Bob Assembly causes the problem. Cant upload a tested fix until the end of the week, but current best fix is to keep mini assemblers enabled in config until issue is resolved.