The log files can be found in your "..\Documents\my games\Sid Meier's Civilization VI\Logs" folder.

Launch a game, reproduce the bug then quit the game, open the lua.log with notepad and copy/paste everything in it in https://pastebin.com/ then post the generated link in a new thread with the description of the problem.

The Database.log and the Modding.log may also be needed to check for incompatibilities.

Thanks.