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Merge pull request #8476 from MicrosoftDocs/update-assembly-version-error-importing-dynamics-365-solution
AB#4655: Some improvements for "/dataverse/working-with-solutions/assembly-version-error-importing-dynamics-365-solution.md"
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‎support/power-platform/dataverse/working-with-solutions/assembly-version-error-importing-dynamics-365-solution.md‎

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---
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title: Assembly version error when importing solution
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description: You may receive an assembly version error when importing a Microsoft Dynamics 365 solution. Provides a resolution.
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ms.reviewer:
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ms.topic: troubleshooting
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ms.date: 03/31/2021
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description: Solves an assembly version error that might occur when importing a Microsoft Dynamics 365 solution.
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ms.date: 03/20/2025
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ms.custom: sap:Working with Solutions
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---
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# Assembly version error when importing a Microsoft Dynamics 365 solution
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# Assembly version error when importing a Dynamics 365 solution
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This article provides a resolution for the assembly version error that occurs when you import a solution in Microsoft Dynamics 365 (online).
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This article provides a resolution for an assembly version error that might occur when you import a solution in Microsoft Dynamics 365.
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_Applies to:_   Microsoft Dynamics 365
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_Original KB number:_   4345239
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## Symptoms
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When you attempt to import a solution in Microsoft Dynamics 365 (online), the import fails with the following message:
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When you try to import a solution in Dynamics 365, the import might fail with the following error message:
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> The import of solution: [solution name] failed
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If you select **Download Log File**, you see details similar to the following message:
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If you select **Download Log File**, you might see a message like this:
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> An error occurred while importing a Solution. : Microsoft.Crm.CrmException: This plugin assembly uses version {0} of the .NET Framework. At this time Microsoft Dynamics 365 requires version {1} of the .NET Framework for plugin assemblies. Rebuild this assembly using .NET Framework version {1} and try again. at Microsoft.Crm.ObjectModel.TargetFrameworkVersionValidator.ValidateInternal() at Microsoft.Crm.ObjectModel.PluginValidatorBase.Validate() at Microsoft.Crm.ObjectModel.PluginAssemblyServiceInternal\`1.ValidateAssemblyMetadata(ExecutionContext context, IBusinessEntity pluginAssembly, CrmPluginAssemblyMetadata assemblyMetadata) at Microsoft.Crm.ObjectModel.PluginAssemblyServiceInternal\`1.VerifyRegistrationAbility(IBusinessEntity pluginAssembly, Boolean createCall, ExecutionContext context, CrmPluginAssemblyMetadata assemblyMetadata) at Microsoft.Crm.ObjectModel.PluginAssemblyServiceInternal\`1.ValidateOperation(String operationName, IBusinessEntity entity, ExecutionContext context) at Microsoft.Crm.ObjectModel.SdkEntityServiceBase.CreateInternal(IBusinessEntity entity, ExecutionContext context, Boolean verifyAction) at Microsoft.Crm.Tools.ImportExportPublish.ImportPluginAssemblyHandler.CreateOrGetExistingPluginAssembly(PluginAssembly pluginAssembly, String fileContent, BusinessProcessObject bpoService, Boolean skipValidation, BusinessEntityCollection& existingPluginAssemblies) at Microsoft.Crm.Tools.ImportExportPublish.ImportPluginAssemblyHandler.ImportItem()
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```output
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An error occurred while importing a Solution. : Microsoft.Crm.CrmException:
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This plugin assembly uses version {0} of the .NET Framework.
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At this time Microsoft Dynamics 365 requires version {1} of the .NET Framework for plugin assemblies. Rebuild this assembly using .NET Framework version {1} and try again. at
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Microsoft.Crm.ObjectModel.TargetFrameworkVersionValidator.ValidateInternal() at Microsoft.Crm.ObjectModel.PluginValidatorBase.Validate() at
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Microsoft.Crm.ObjectModel.PluginAssemblyServiceInternal`1.ValidateAssemblyMetadata(ExecutionContext context, IBusinessEntity pluginAssembly, CrmPluginAssemblyMetadata assemblyMetadata) at
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Microsoft.Crm.ObjectModel.PluginAssemblyServiceInternal`1.VerifyRegistrationAbility(IBusinessEntity pluginAssembly, Boolean createCall, ExecutionContext context, CrmPluginAssemblyMetadata assemblyMetadata) at
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Microsoft.Crm.ObjectModel.PluginAssemblyServiceInternal`1.ValidateOperation(String operationName, IBusinessEntity entity, ExecutionContext context) at
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Microsoft.Crm.ObjectModel.SdkEntityServiceBase.CreateInternal(IBusinessEntity entity, ExecutionContext context, Boolean verifyAction) at
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Microsoft.Crm.Tools.ImportExportPublish.ImportPluginAssemblyHandler.CreateOrGetExistingPluginAssembly(PluginAssembly pluginAssembly, String fileContent, BusinessProcessObject bpoService, Boolean skipValidation, BusinessEntityCollection& existingPluginAssemblies) at
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Microsoft.Crm.Tools.ImportExportPublish.ImportPluginAssemblyHandler.ImportItem()
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```
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In the example provided above, {0} is a version that is too high and {1} is the currently supported version. You may also see a reference to error code **8004420B**, **8004418B**, or **-2147204725**.
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In the preceding log, `{0}` represents the .NET Framework version used in the plug-in assembly, which is incompatible, and `{1}` represents the .NET Framework version required by Dynamics 365. Additionally, you might receive error codes such as **8004420B**, **8004418B**, or **-2147204725**.
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## Cause
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This error can occur if you are trying to import a solution that includes a plugin assembly compiled on a version of the .NET Framework that is not currently supported by Microsoft Dynamics 365 (online).
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This error occurs when the imported solution includes a plug-in assembly compiled using a version of the .NET Framework that's not currently supported by Dynamics 365.
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## Resolution
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Recompile the assembly using the mentioned version of the .NET Framework.
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To solve this issue, recompile the plug-in assembly using the specified version of the .NET Framework, and then reimport the solution.
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For information about the .NET Framework version currently supported by Microsoft Dynamics 365 (online), see [Supported extensions for Microsoft Dynamics 365](/previous-versions/dynamicscrm-2016/developers-guide/gg328350(v=crm.8)).
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## More information
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- For information about the .NET Framework versions currently supported by Dynamics 365, see [Support for .NET Framework versions](/power-apps/developer/data-platform/supported-customizations#support-for-net-framework-versions).
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- For guidelines on configuring and building assemblies for Microsoft Dataverse plug-ins, see [Build and package plug-in code](/power-apps/developer/data-platform/build-and-package).

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