The assembly mscorlib.dll was not found or could not be loaded.
It should have been installed in the `C:\FXServer\serwer\citizen/clr2/lib/\mono\4.5\mscorlib.dll’ directory.
i don’t know what I must do ;/
Please help me 
Hi
try updating yours citizens
Here you have what you need
take last version
/artifacts/fivem/build_server_windows/master/ / FiveM Artifacts