Unfortunately, Unturned is quite an unstable game, and this has become more common recently.
95% of the time, we can resolve the issues with the game with 2 steps.
- Open the file manager, go to the /servers/pingperfect/level/[name of the map you're running] folder and delete the lighting.dat file. This resolves the game throwing the "could not divide by zero" error.
- Run a steam update. This scans the game files for any damaged or outdated files and redownloads them if it finds them. This repairs damage that sometimes occurs to key game files.
If these fixes do not work for you, open a support ticket and we will look into it for you.
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