(12:11:11) | Exception while resolving plugin references (InvalidOperationException: No process is associated with this object.)
  at System.Diagnostics.Process.EnsureState (System.Diagnostics.Process+State state) [0x00018] in <ae22a4e8f83c41d69684ae7f557133d9>:0 
  at System.Diagnostics.Process.get_Handle () [0x00000] in <ae22a4e8f83c41d69684ae7f557133d9>:0 
  at (wrapper remoting-invoke-with-check) System.Diagnostics.Process.get_Handle()
  at Oxide.Plugins.PluginCompiler.CheckCompiler () [0x00028] in <008b12f41ec4452da1a5497eeb849299>:0 
  at Oxide.Plugins.PluginCompiler.EnqueueCompilation (Oxide.Plugins.Compilation compilation) [0x0000f] in <008b12f41ec4452da1a5497eeb849299>:0 
  at Oxide.Plugins.PluginCompiler+<>c__DisplayClass20_0.<Compile>b__0 () [0x00000] in <008b12f41ec4452da1a5497eeb849299>:0 
  at Oxide.Plugins.Compilation+<>c__DisplayClass23_0.<Prepare>b__0 (System.Object _) [0x001f6] in <008b12f41ec4452da1a5497eeb849299>:0

Just put this plugin on my server and this popped up

are you running a linux system?