I usually can fix problems like this, but I can't even find where that file (\Managers\PresetMan.cpp)is even if I search on my whole computer. If somebody can help me it would be greatly appreciated.

Something is wrong with the amrobotics.rte index.ini
Re-download amrobotics to fix it.

Your amrobotics.rte is messed up, the Index.ini does not include the "DataModule" line as the first line.
EDIT: Ninja'd

actually guessing by the error I'd say that the index.ini is absent entirely

I believe it acts the same between a missing index.ini and one that doesn't have DataModule at the top. I could be wrong though.

I'm not 100% sure but I think there might be a slightly differently worded error for index.ini w/o datamodule

Ok, that fixed it. Thanks.