Looks like loading version 0.1.2 multiple times had an issue where the statistics tracking (keeps track of how many of each building had already spawned) gets wiped out. I have now fixed the error in 0.1.4 by resetting your stat tracking to 0 if they were lost. This means that continuing a game with that error might have a few more assembling machines spawning than usual for a little while(since my logic is designed to start you out with extra assembling machines towards the start of the game), but shouldn't cause any issues otherwise.
Please upgrade to 0.1.4, and thank you for your bug report.
