Model import fails, with CreateData NullReference

mirai

Unity Version: 2019.4.40f
Live2D SDK Setting: SDK4.2/Cubism4.2
Cubism for Unity Version: Cubism 4 SDK for Unity R4_2

and I got this:
```
System.NullReferenceException: Object reference not set to an instance of an object
at Live2D.Cubism.Core.CubismDynamicDrawableData.CreateData (Live2D.Cubism.Core.Unmanaged.CubismUnmanagedModel unmanagedModel) [0x00001] in F:\!UnityProjects\Live2DStudio\Assets\Live2D\Cubism\Core\CubismDynamicDrawableData.cs:29
at Live2D.Cubism.Core.CubismTaskableModel..ctor (Live2D.Cubism.Core.CubismMoc moc) [0x00038] in F:\!UnityProjects\Live2DStudio\Assets\Live2D\Cubism\Core\CubismTaskableModel.cs:145
at Live2D.Cubism.Core.CubismModel.Reset (Live2D.Cubism.Core.CubismMoc moc) [0x00016] in F:\!UnityProjects\Live2DStudio\Assets\Live2D\Cubism\Core\CubismModel.cs:295
at Live2D.Cubism.Core.CubismModel.InstantiateFrom (Live2D.Cubism.Core.CubismMoc moc) [0x00022] in F:\!UnityProjects\Live2DStudio\Assets\Live2D\Cubism\Core\CubismModel.cs:71
at Live2D.Cubism.Framework.Json.CubismModel3Json.ToModel (Live2D.Cubism.Framework.Json.CubismModel3Json+MaterialPicker pickMaterial, Live2D.Cubism.Framework.Json.CubismModel3Json+TexturePicker pickTexture, System.Boolean shouldImportAsOriginalWorkflow) [0x00022] in F:\!UnityProjects\Live2DStudio\Assets\Live2D\Cubism\Framework\Json\CubismModel3Json.cs:382
at Live2D.Cubism.Editor.Importers.CubismModel3JsonImporter.Import () [0x00003] in F:\!UnityProjects\Live2DStudio\Assets\Live2D\Cubism\Editor\Importers\CubismModel3JsonImporter.cs:168
at Live2D.Cubism.Editor.Importers.CubismImporterBase.Live2D.Cubism.Editor.Importers.ICubismImporter.Import () [0x00001] in F:\!UnityProjects\Live2DStudio\Assets\Live2D\Cubism\Editor\Importers\CubismImporterBase.cs:63
at Live2D.Cubism.Editor.CubismAssetProcessor.OnPostprocessAllAssets (System.String[] importedAssetPaths, System.String[] deletedAssetPaths, System.String[] movedAssetPaths, System.String[] movedFromAssetPaths) [0x00031] in F:\!UnityProjects\Live2DStudio\Assets\Live2D\Cubism\Editor\CubismAssetProcessor.cs:72
UnityEngine.Debug:LogError (object)
Live2D.Cubism.Editor.CubismAssetProcessor:OnPostprocessAllAssets (string[],string[],string[],string[]) (at Assets/Live2D/Cubism/Editor/CubismAssetProcessor.cs:77)
UnityEngine.GUIUtility:ProcessEvent (int,intptr)
```

When I debugged it, I got:

mirai

error message was: [CSM] [E]csmReviveMocInPlace is failed. The Core unsupported later than moc3 ver:[3]. This moc3 ver is [4]. What is moc3 version, and where can I downgrade it?

yasu.o@live2d

Hello, @mirai .
Thank you for your contact.
This is Live2D Support.

Cubism SDK for Unity R4_2 does not support Cubism 4.2 format models.
Please see "Cubism Unity Components change history" for details.
If you use Cubism 4.2 format models, please use Cubism SDK for Unity R5 beta1 or later.

Best regards.