[Oxide] 23:02 [Error] Error while compiling Backpacks: 'Image' is an ambiguous reference between 'System.Net.Mime.MediaTypeNames.Image' and 'UnityEngine.UI.Image' | Line: 3285, Pos: 27

+

[Oxide] 23:06 [Error] Failed to call hook 'OnPlayerDisconnected' on plugin 'Backpacks v3.17.2' (NullReferenceException: Object reference not set to an instance of an object)
  at Oxide.Plugins.Backpacks+BackpackNetworkController.Unsubscribe (BasePlayer player) [0x00029] in <4cc90cf6ed2243bfb639504112b0c814>:0
  at Oxide.Plugins.Backpacks.OnPlayerDisconnected (BasePlayer player) [0x0003a] in <4cc90cf6ed2243bfb639504112b0c814>:0

  at Oxide.Plugins.Backpacks.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x007c3] in <4cc90cf6ed2243bfb639504112b0c814>:0
  at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <42f9bedc659b4f4786eb778d3cd58968>:0
  at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000de] in <15f61ddda771464d8246ebdce8ff4811>:0
  at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <15f61ddda771464d8246ebdce8ff4811>:0

Update to 3.17.3

i update and the 

'Image' is an ambiguous reference between" is from new version

I am not seeing that compilation error. Do you have any other software installed in your Rust server such as dlls for plugins or extensions?

ok. after clean all files and back pack, all error gone, and plugin works ok no any kind of error.