"Modified Map Version" Unturned
Having this issue, (the server using a modified version of the map) this guide will help you!
1. Find the page of your server
2. Find the mod that is causing the issue
3. Visit its workshop page and copy its page url by right clicking
4. Now close Unturned, open your File Explorer, locate your Steam folder.
(Then steamapps\workshop\content\304930 (File directory))
5. When your in the workshop folder, press the search bar and paste the link from before. Delete the front so that you only have the number at the end. (2288217813 in this case).
6. When you've found your folder, delete it, if its not there double check your number, you might not have the mod in the first place.
Hope this fixed the problem!
Feel free to contact me Unodro#4997