---
title: unknownDataStoreSchema
framework: swiftdata
role: symbol
role_heading: Type Property
path: swiftdata/swiftdataerror/unknowndatastoreschema
---

# unknownDataStoreSchema

An error that indicates the data store’s schema is not recognized.

## Declaration

```swift
static let unknownDataStoreSchema: SwiftDataError
```

## Discussion

Discussion This error occurs when a ModelContainer attempts to load a data store whose schema does not match the current schema or any schema defined in the provided migration plan. When you encounter this error, the data store likely contains data from a schema version that your app no longer supports. To resolve this: Add the missing schema version to your SchemaMigrationPlan Provide a custom migration stage to handle the unrecognized schema Consider whether the data store should be recreated This error is only thrown on processes linked on or after macOS 27 / iOS 27. On earlier versions, loadIssueModelContainer is thrown instead.