Unity 5 giving errors on older project: Do not use ReadObjectThreaded on scene objects!

Questions & Answers
1

I cannot figure out where this specific error comes from. Because my search on google gives no unity errors as a search result.

I have a older project which i now openend in the new unity version. The result was that the API updater could not update all scripts because of this. Can anyone help me out here?

3

In case someone else has this error, it seems to happen when LoadAllAssetsAtPath ends up being called on a scene path. This fixed it for me:

public static Object[] LoadAllAssetsAtPath(string assetPath) {
	return typeof(SceneAsset).Equals(AssetDatabase.GetMainAssetTypeAtPath(assetPath)) ?
		// prevent error "Do not use readobjectthreaded on scene objects!"
		new[] { AssetDatabase.LoadMainAssetAtPath(assetPath) } :
		AssetDatabase.LoadAllAssetsAtPath(assetPath);
}

Thanks to Glurth’s answer!

2

I had this dreaded error. The API updater worked, but unity 5 crashed whenever I tried to build a stand alone build (Windows desktop).

I eventually narrowed it down to meshFilters with a null shared mesh. I had a few MeshFilters with a null shared mesh coupled with a MeshRenderer that had a material in its array of materials. Deleting those objects fixed the issue no more error message and stand alone worked.

I made this script to delete the offending components

[MenuItem( “BuildPlatforms/CI/ShowNullMeshFilters” )]

    static void ShowNullMeshFilters()
    {
        var res = GameObject.FindObjectsOfType<MeshFilter>();
        //dreaded Do not use ReadObjectThreaded on scene objects!
        foreach (var nmo in res)
        {
            if (nmo.sharedMesh == null)
            {
                Debug.LogError("null meshfilter in " + nmo.transform.fullname(), nmo.gameObject);
                Transform t = nmo.transform;
                GameObject.DestroyImmediate(t.GetComponent<MeshRenderer>());
                GameObject.DestroyImmediate(nmo);
                
            }
        }
        res = null;
    }