extra details, i got this message when opening terraraserver.exe
Unhandled Exception: System.IO.FileNotFoundException: Could not load file or assembly 'Microsoft.Xna.Framework.dll' or one of its dependencies. The specified module could not be found.
at Terraria.Program.LaunchGame(String[] args, Boolean monoArgs)
at Terraria.WindowsLaunch.Main(String[] args)