Hi, this is my first post here.
Using Unity version 6000.0.58f2
For some reason, now when i enter a playmode or save a script, it start showing these 3 errors in console (sometimes it is only two = middle one and bottom one)
There are the errors:
Weird is that it does not affect my game: it does not pause game (with error pause), and game plays completely normal.
There is what pops up in inspector when i click on the middle error or the bottom error:
If it does not have any solution besides changing Unity version, i would do that. I just want to know, if there is any easy solution for it.
Thanks for any comment 
Hm, kinda funky… did you try reimport all, or perhaps reset layouts in the editor (upper right?)
When i tried to see the errors again, its seems very random when they start to show up. Saving change in script and enter playmode does not show errors. I will try things that you said after i will see the errors. But thanks for the reply!
Do you have other broken Inspector drawn blank? If so you ran into the Inspector issue others have reported which first appeared in 58f1 (unfortunate timing) but it might be fixed already in 60f1 so try updating to that version.
These Inspector issues are all associated with various console messages (info and/or error logs) not originating from user code, but somehow linked to UI.
I think i dont have broken inspector, everything i used in inspector worked, but i think that is very likely that the errors means something about inspector. I will probably update my Unity 6 version to the new one. Thanks for the reply
I know a couple of months have passed and this isn’t a full solution, but I encountered the same issue and found a fix that worked for my case.
My project is on Unity 6000.3.0f1.
I ran into this error after I created a Prefab Variant from an imported model and assigned that variant in the Inspector as a reference for a script. As soon as I attached it in the Inspector, I started getting the same errors. At first I didn’t realise that was the cause - I had attached several other prefabs to a list in the Inspector - and it took me a couple of hours to trace my recent changes before I found the problematic prefab variant.
My solution was to delete that prefab variant, unpack the imported model in the scene, and then create a new prefab from the unpacked object. To be extra sure, I also closed Unity, deleted the project’s Library folder, and reopened the project. After that I could attach the new prefab without any errors.
I’m not certain that clearing the Library folder was strictly necessary, but I noticed once the error appears it tends to persist until at least a Unity restart, so I did it to be sure.
Update. There’s 6000.3.8f1 by now. For your own benefit, don’t stay on early release versions (below 10-20), they’re practically “public beta” versions. Updating early release versions frequently is painless and recommended particularly if you run into any troubles.
The “m_Target doesn’t exist” used to be recurring but I haven’t seen any reports of it since end of last year.
I am still getting this error on 6000.3.8f1, so it’s not just an old version. Thought it had to do with having a prefab variant open in play mode, but it seems to happen regardless.
Same here, on several different projects. I think it’s a Unity bug.
Started getting this error constantly now too (6000.3.6f1)
One thing I noticed is that when this error happens, the Inspector properties window jumps to select and display the last Package Manifest in the project, in alphabetical order.
Currently, it displays the Visual Effect Graph Manifest for me, for example. If I install the Visual Script package, it displays that instead.
Update to 10f1. At least one selection issue (after exiting playmode) has been fixed since. Not sure if it’s related but it’s recommended to stay close to the latest release version, particularly if you run into any issues.
6000.3.14f1
This error is still present.
I used to rollback the Scene using Git to get rid of it, but you can imagine how inconvenient that is. Especially when I finally let it slip into MR and rolling back is not an option anymore.
So please, kindly FIX. THAT. SH*T. Thank you
SerializedObjectNotCreatableException: Object at index 0 is null
UnityEditor.Editor.CreateSerializedObject () (at <bf875d6ac1d54ad28ee4928f2de2def1>:0)
UnityEditor.Editor.GetSerializedObjectInternal () (at <bf875d6ac1d54ad28ee4928f2de2def1>:0)
UnityEditor.Editor.get_serializedObject () (at <bf875d6ac1d54ad28ee4928f2de2def1>:0)
UnityEditor.TransformInspector.OnEnable () (at <bf875d6ac1d54ad28ee4928f2de2def1>:0)
MissingReferenceException: The variable m_Targets of GameObjectInspector doesn't exist anymore.
You probably need to reassign the m_Targets variable of the 'GameObjectInspector' script in the inspector. Parameter name: componentOrGameObject
UnityEngine.Object+MarshalledUnityObject.TryThrowEditorNullExceptionObject (UnityEngine.Object unityObj, System.String parameterName) (at <6567e2a645a94ef68fffcf0e5cb82d14>:0)
UnityEngine.Bindings.ThrowHelper.ThrowArgumentNullException (System.Object obj, System.String parameterName) (at <6567e2a645a94ef68fffcf0e5cb82d14>:0)
UnityEditor.PrefabUtility.IsPartOfVariantPrefab (UnityEngine.Object componentOrGameObject) (at <bf875d6ac1d54ad28ee4928f2de2def1>:0)
UnityEditor.GameObjectInspector.OnEnable () (at <bf875d6ac1d54ad28ee4928f2de2def1>:0)
