Everytime i try to join a specific server it says "This server is using a modified version of the map" I was able to join it yesterday so i don't understand the problem

Everytime i try to join a specific server it says “This server is using a modified version of the map” I was able to join it yesterday so i don’t understand the problem.

If you have edited the map, you need to update it,
it would be in ~unturned_installation~/Maps/

and you could try clearing workshop for that map mod