I actually think this is a different problem, but you have pages and pages of this kind of error:
Code:
[1586412.527] Runtime Error: Assets\UI_bc1 - Put in DLC to enable UI mod\PlotHelp\PlotHelpManager.lua:944: attempt to index field 'UNIT_WORKER' (a nil value)
stack traceback:
Assets\UI_bc1 - Put in DLC to enable UI mod\PlotHelp\PlotHelpManager.lua:944: in function 'PlotToolTip'
Assets\UI_bc1 - Put in DLC to enable UI mod\PlotHelp\PlotHelpManager.lua:1104: in function 'OnUpdate'
Assets\UI_bc1 - Put in DLC to enable UI mod\PlotHelp\PlotHelpManager.lua:1116: in function 'ResetTimer'
Assets\UI_bc1 - Put in DLC to enable UI mod\PlotHelp\PlotHelpManager.lua:1152: in function <Assets\UI_bc1 - Put in DLC to enable UI mod\PlotHelp\PlotHelpManager.lua:1146>
I'm not very familiar with bc1's UI mod, but I take it from this error that files are added in a "non-mod" way. They are clearly running here and that is not a good thing. At best, you aren't seeing a lot of UI generated by the mod (magical plot effects, etc).