I had the same problem. It works on the real device, but fails systematically on simulator. I run Beta8 on macOS Tahoe and the latest Xcode beta. Error: guardrailViolation(FoundationModels.LanguageModelSession.GenerationError.Context(debugDescription: "May contain sensitive or unsafe content", underlyingErrors: [Error Domain=com.apple.SensitiveContentAnalysisML Code=15 "Failed model manager query for model com.apple.fm.language.instruct_300m.safety: Model Catalog error: Error Domain=com.apple.UnifiedAssetFramework Code=5000 "There are no underlying assets (neither atomic instance nor asset roots) for consistency token for asset set com.apple.modelcatalog" UserInfo={NSLocalizedFailureReason=There are no underlying assets (neither atomic instance nor asset roots) for consistency token for asset set com.apple.modelcatalog}" UserInfo={NSLocalizedDescription=Failed model manager query for model com.apple.fm.language.instruct_300m.safety: Model Catalog error: Error Domain=com.apple.UnifiedAssetFramework Code=5000 "There are no underlying assets (neither atomic instance nor asset roots) for consistency token for asset set com.apple.modelcatalog" UserInfo={NSLocalizedFailureReason=There are no underlying assets (neither atomic instance nor asset roots) for consistency token for asset set com.apple.modelcatalog}, NSUnderlyingError=0x600003300960 {Error Domain=ModelManagerServices.ModelManagerError Code=1026 "Model Catalog error: Error Domain=com.apple.UnifiedAssetFramework Code=5000 "There are no underlying assets (neither atomic instance nor asset roots) for consistency token for asset set com.apple.modelcatalog" UserInfo={NSLocalizedFailureReason=There are no underlying assets (neither atomic instance nor asset roots) for consistency token for asset set com.apple.modelcatalog}"}}]))