Greetings, I just exported my mod from the website and tried to play the game with. I have encountered a few errors and fixed most of them, there's only this one error that doesn't really tell me what is wrong. Here is the error in question;

[22:59:01][id.cpp:97]: Failed to create id 1 50. Already exists in game. This might crash the game.

What does it mean? 

Any help will be much appreciated.

the id is probably a building id (the one that says REPLACE_ME_WITH_UNIQUE_IDENTIFIER) which has the same id as someother  building . i dont know though just thought cuz no ones looks in the forums and ive had an error like that