Error codes returned by package validation

This reference article lists all the error codes generated by package validation.

List of error codes

Diagnostic ID	Description	Recommended action
PKV0001	A compile-time asset for a compatible framework is missing.	Add the appropriate target framework to the project.
PKV0002	A run-time asset for a compatible framework and runtime is missing.	Add the appropriate asset for corresponding runtime to the package.
PKV0003	A run-time independent asset for a compatible framework is missing.	Add the appropriate run-time independent target framework to the project.
PKV0004	A compatible run-time asset for a compile-time asset is missing.	Add the appropriate run-time asset to the package.
PKV0005	A compatible run-time asset for a compile-time asset and a supported runtime identifier is missing.	Add the appropriate run-time asset to the package.
PKV0006	The target framework is dropped in the latest version.	Add the appropriate target framework to the project.
PKV0007	The target framework and runtime identifier pair is dropped in the latest version.	Add the appropriate target framework and RID to the project.
CP0001	A type, enum, record, or struct visible outside the assembly is missing in the compared assembly when required to be present.	Add the missing type to the assembly where it is missing.
CP0002	A member that is visible outside of the assembly is missing in the compared assembly when required to be present.	Add the missing member to the assembly where it is missing.
CP0003	Some part of the assembly identity (name, public key token, culture, retargetable attribute, or version) does not match on both sides of the comparison.	Update the assembly identity so that both sides match.
CP0004	A matching assembly was not found on one side of the comparison when creating the assembly mapping.	Make sure the missing assembly is added to the package.
CP0005	An abstract member was added to the right side of the comparison to an unsealed type.	Remove the abstract member or don't annotate it as abstract.
CP0006	A member was added to an interface without a default implementation.	If the target framework and language version support default implementations, add one, or just remove the member from the interface.
CP0007	A base type on the class hierarchy was removed from one of the compared sides.	Add the base type back (a new base type can be introduced in the hierarchy if that's intended).
CP0008	A base interface was removed from the interface hierarchy from one of the compared sides.	Add the interface back to the hierarchy.
CP0009	A type that was unsealed on one side was annotated as sealed on the other compared side.	Remove the sealed annotation from the type.
CP0010	The underlying type of an enum changed from one side to the other.	Change the underlying type back to what it was previously.
CP0011	The value of a member in an enum changed from one side to the other.	Change the value of the member back to what it was previously.
CP1001	A matching assembly could not be found in the search directories. (Not applicable for Package Validation, only when using API Compat directly.)	Provide the search directory when loading matching assemblies using the AssemblySymbolLoader.
CP1002	A reference assembly was not found when loading the assemblies to compare in the resolved directories for the current target framework.	Include the directory path where that assembly can be found using the following MSBuild item: <PackageValidationReferencePath Include="<path>" TargetFramework="<tfm>" />.
CP1003	There was no search directory provided for the target framework moniker that the package validation is running API Compat for.	Provide the search directory to find references for that target framework using the following MSBuild item: <PackageValidationReferencePath Include="<path>" TargetFramework="<tfm>" />.