Same issue here. RC of macOS 15, and Xcode, on Mac Pro: The operation couldn’t be completed. (ModelCatalog.CatalogErrors.AssetErrors error 1.) Domain: ModelCatalog.CatalogErrors.AssetErrors Code: 1 User Info: { DVTErrorCreationDateKey = "2024-09-09 20:59:03 +0000"; } -- Failed to find asset: com.apple.fm.code.generate_small_v1.tokenizer - no asset Domain: ModelCatalog.CatalogErrors.AssetErrors Code: 1 -- System Information macOS Version 15.0 (Build 24A335) Xcode 16.0 (23050) (Build 16A242) Timestamp: 2024-09-09T16:59:03-04:00

Don't know what and how it happened. But overnight it fixed itself, and now I see that I have this model downloaded and it works in Xcode. Magic...