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Docs > Debugging, Testing and Error Handling > Automatic Code Error Diagnostics > XAF0026: Use the supported version of EF Core packages
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V25.1
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    XAF0001: Implement XPO business class constructors correctly
    XAF0002: XPO business class properties should not be overridden
    XAF0003: XPO business classes should be public
    XAF0004: Implement XAF controller constructors correctly
    XAF0005: XAF controller classes should be public
    XAF0006: Invalid target platform. Change the target platform to "Any CPU" in the project or solution properties
    XAF0007: The Build Action property of the XAFML file must be set to Embedded resource
    XAF0008: The current Visual Studio version is not supported or .NET 9+ SDK is not installed
    XAF0009: Properties decorated with the RuleRequiredFieldAttribute should be of nullable or reference type
    XAF0010: Set the DelayedAttribute.UpdateModifiedOnly property to True
    XAF0011: Implement the delayed property correctly
    XAF0012: Avoid calling the XafApplication.CreateObjectSpace() method overload without the Type parameter
    XAF0013: Avoid reading the XafApplication.ConnectionString property
    XAF0014: The property with the Association attribute must have a correct unique pair
    XAF0015: Association must not have the Aggregated attribute if it is paired to the "many" end of the association
    XAF0016: Descendants of NonPersistentBaseObject and NonPersistentLiteObject must be decorated with the DomainComponent attribute
    XAF0017: Incompatible assemblies must not be added to the same project
    XAF0018: Avoid creating a new Session/UnitOfWork with parameterless constructors in XPO-based projects
    XAF0019: Apply ExplicitLoadingAttribute only to reference properties
    XAF0020: Avoid applying NonPersistentAttribute to properties without a public setter
    XAF0021: Create new controllers correctly
    XAF0022: Avoid using the ShowViewStrategy.ShowView method
    XAF0023: Do not implement IObjectSpaceLink in the XPO classes
    XAF0024: Do not implement IXafEntityObject in the XPO classes
    XAF0025: Use the corresponding XAF ORM-agnostic or Entity Framework attribute
    XAF0026: Use the supported version of EF Core packages
    XAF0027: Do not apply DomainComponentAttribute to the XPO business class
    XAF0028: Use the corresponding XPO attribute
    XAF0029: Use the enclosing property name in a method call
    XAF0030: Use generic members without the type parameter to declare your association property
    XAF0031: Add the UseChangeTrackingProxies() call for automatic UI updates
    XAF0032: Use the explicit syntax to create an instance of the CriteriaOperator class
    XAF0033: EF Core business class properties should not be overridden
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    XAF0026: Use the supported version of EF Core packages

    Severity: Error

    XAF supports the following EF Core versions:

    XAF version EF Core packages version
    XAF v22.1 and below EF Core 5
    XAF v22.2+ EF Core 6.x.x
    XAF v23.1+ EF Core 6.x.x and 7.x.x
    XAF v23.2+ EF Core 6.x.x, 7.x.x, and 8.x.x (CTP)
    XAF v24.1+ EF Core 6.x.x, 7.x.x, and 8.x.x
    XAF v24.2+ EF Core 8.x.x and 9.x.x

    For more information on Entity Framework Core support in XAF, refer to the following topics and examples: