Question Could not resolve type with token 010000b4

Hello, i am trying to open and build an AR project for android on 2020.1.9f1 version. It has no error until i try and build it then this appears.. any help would be great. Also when i go to player settings it is all blank :/

TypeLoadException: Could not resolve type with token 010000b4 (from typeref, class/assembly UnityEditor.AndroidAssetPackImporter, UnityEditor, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null)
UnityEditor.Android.PostProcessor.Tasks.CheckPrerequisites.Execute (UnityEditor.Android.PostProcessor.PostProcessorContext context) (at <c8b3b39837d14a59b516963b78bf9032>:0)
UnityEditor.Android.PostProcessor.PostProcessRunner.RunAllTasks (UnityEditor.Android.PostProcessor.PostProcessorContext context) (at <c8b3b39837d14a59b516963b78bf9032>:0)
UnityEditor.Android.PostProcessAndroidPlayer.PrepareForBuild (UnityEditor.BuildOptions options, UnityEditor.BuildTarget target) (at <c8b3b39837d14a59b516963b78bf9032>:0)
UnityEditor.Android.AndroidBuildPostprocessor.PrepareForBuild (UnityEditor.BuildOptions options, UnityEditor.BuildTarget target) (at <c8b3b39837d14a59b516963b78bf9032>:0)
UnityEditor.PostprocessBuildPlayer.PrepareForBuild (UnityEditor.BuildOptions options, UnityEditor.BuildTargetGroup targetGroup, UnityEditor.BuildTarget target) (at <cdc1918cb795429dbbd46f2de52cb053>:0)
UnityEngine.GUIUtilityrocessEvent(Int32, IntPtr, Boolean&)


and this

Error building Player: TypeLoadException: Could not resolve type with token 010000b4 (from typeref, class/assembly UnityEditor.AndroidAssetPackImporter, UnityEditor, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null)