Can't find file for non-existent asset

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Hi please help me I have the same problem. When packaging the engine tries to load inexistent files
For example:
“UATHelper: Packaging (Windows (64-bit)): Cook: LogUObjectGlobals: Warning: Failed to load ‘/Game/ArchVis/Materials/M_Ceramic_Mat_Inst’: Can’t find file ‘/Game/ArchVis/Materials/M_Ceramic_Mat_Inst’”

Could you please help?