Can't find file for asset 'xxx' while loading NULL

Development Asset Creation
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1

I have a project made by UE4.10, then make a copy to UE4.12.5

There is a material folder in : game\materials

For some resean , i move this folder to game\YBF\materials , then fix all redirectors

When reopening the project ,OutputLOG says: Can’t find file for asset ‘/Game/Material/M_woshi1_penzai_02’ while loading NULL.

I found that the materials of the static mesh assigned in StaticMeshEditor have all been lost

The materials of the static mesh assigned in current level are there still

2

Did you ever figure this out? Having the same issue.