I just started my first server and i get this message

(21:54:11) | Could not check for update to Compiler.exe

(21:54:11) | The URI prefix is not recognized.

(21:54:11) | Exception while starting compiler version Unknown: (Win32Exception: ApplicationName='D:\rust\server\RustServer\Compiler.exe', CommandLine='/service /logPath:D:\rust\server\RustServer\oxide\logs', CurrentDirectory='', Native error= The system cannot find the file specified.

)

at System.Diagnostics.Process.StartWithCreateProcess (System.Diagnostics.ProcessStartInfo startInfo) [0x002dc] in <ae22a4e8f83c41d69684ae7f557133d9>:0

at System.Diagnostics.Process.Start () [0x0003a] in <ae22a4e8f83c41d69684ae7f557133d9>:0

at (wrapper remoting-invoke-with-check) System.Diagnostics.Process.Start()

at Oxide.Plugins.PluginCompiler.CheckCompiler () [0x001f3] in <8a646463979e4a1d9c0e2f1298e9483f>:0

(21:54:11) | Win32 NativeErrorCode: 2 ErrorCode: -2147467259 HelpLink:

(21:54:11) | Error while compiling: compiler version Unknown couldn't be started

how can i fix this? its not generating json files for plugins

That means the compiler failed to download automatically. See https://umod.org/community/general-support/10494-manual-download-for-compiler?page=1#post-2

It's likely that your ISP or server is blocking the connection.