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I narrowed it down to your mod. It seems to be clashing with your mod.
I first diabled all mods... no errors.
Then I added each one in groups of 5.
I then got the error on youts.
The error was cruptic, didn't tell me a thing.
 
Okay. I have it narrowed down now.
You mod is clashing with the Extra Lib (and its depency Extra AssetsImporter)
mods. I ONLY have those 2 mods and your mod (and l18nEveryWhere) mods enabled
I know its your mod clashing (oe the other Lib) because all the mods I specify here worked UNTIL I enabled your mod.
 
After activation, there will be an error message, 1.2.3f1

[ERROR] Collection was modified; enumeration operation may not execute.

InvalidOperationException: Collection was modified; enumeration operation may not execute.
at System.Collections.Generic.HashSet`1+Enumerator[T].MoveNext () [0x00013] in <a314714511a14f84b853c03efd8682b8>:0
at Colossal.IO.AssetDatabase.AssetDatabase+<GetAssets>d__71`1[T].MoveNext () [0x00137] in <93949817766a42c1a3702853294a1fe1>:0
 
Okay. I have it narrowed down now.
You mod is clashing with the Extra Lib (and its depency Extra AssetsImporter)
mods. I ONLY have those 2 mods and your mod (and l18nEveryWhere) mods enabled
I know its your mod clashing (oe the other Lib) because all the mods I specify here worked UNTIL I enabled your mod.

After activation, there will be an error message, 1.2.3f1

[ERROR] Collection was modified; enumeration operation may not execute.

InvalidOperationException: Collection was modified; enumeration operation may not execute.
at System.Collections.Generic.HashSet`1+Enumerator[T].MoveNext () [0x00013] in <a314714511a14f84b853c03efd8682b8>:0
at Colossal.IO.AssetDatabase.AssetDatabase+<GetAssets>d__71`1[T].MoveNext () [0x00137] in <93949817766a42c1a3702853294a1fe1>:0

Thank you for digging into this. I've spoken with triton_supreme, the creator of EAI and apparently that is an error only caused by that mod and appears randomly. He also said that it shouldn't impact your game so you can close it and proceed.
 
Seems my game just automatic disable the fast building feature, even its enabled by this mod but it always shows 'disable' in dev menu, still not works after i re-enable it in dev menu, not sure if there are some mods got conflicts with this one

I finally found out the incompatible mod, 'Realistic Workplaces And Households', hope it will be compatible soon