Hey man I absolutely love the concept of this mod, and after a lot of trawling through the forums I picked it as one of the few mods I installed because it adds more levels for the most number of different techs (compared to other mods which only add them for some), but after using it and checking ...

Heya, it crashes on Factorio start if you don't have bobs mods installed, throwing an error on line 63 of data.lua

I was able to fix it easily though by wrapping line 63 onwards in a "if bobmods.ores then [...] end" block