The game doesn't load or create any map when Mekanism Tools is present. The error message is refering to data pack:
"Errors in currently selected datapacks prevented the world from loading.
You can either try to load it with only the vanilla data pack ("safe mode"), or go back to the title screen and fix it manually"
Even the safe mode doesn't seem to work (staying on the same error).

Report logs: latest.log

This is a known issue, good to know it can be replicated.

Need someone to test this with just MekanismTools