Error when running the sample project in isaac sim unity3d Editor Mode

Hi,
I try to run the “medium_warehouse” and follow these steps.

But I got an error like this:

NullReferenceException: Object reference not set to an instance of an object
Substance.Editor.EntryPoint.NeedsReImport (System.String pPath) (at <c84dad347d4b4c7c97bcf77c1e11b982>:0)
Substance.Editor.EntryPoint.HandleAssignedTextures () (at <c84dad347d4b4c7c97bcf77c1e11b982>:0)
Substance.Editor.EntryPoint.StateChange (UnityEditor.PlayModeStateChange state) (at <c84dad347d4b4c7c97bcf77c1e11b982>:0)
UnityEditor.EditorApplication.Internal_PlayModeStateChanged (UnityEditor.PlayModeStateChange state) (at /home/bokken/buildslave/unity/build/Editor/Mono/EditorApplication.cs:415)

I tried unity version 2019.4.10f1 and 2020.1.3f1.
Can give me some advice or help? Thanks!

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