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title	description	type	page_title	slug	tags	ticketid	res_type
Version Conflict Detected for Telerik.Zip	Learn how to fix a NuGet version conflict error that may occur when using different incompatible versions of Telerik UI for Blazor and Telerik Document Processing in the same Blazor project.	troubleshooting	How to Fix Version Conflict Detected Error for Telerik.Zip	dpl-kb-version-conflict-detected-telerik-zip	telerik, blazor, dpl, document processing	1666834, 1663672, 1652709, 1651020, 1649684, 1647998, 1647404, 1646717	kb

Environment

Product

UI for Blazor
Telerik Document Processing

Description

Visual Studio and the .NET SDK throw an error if incompatible versions of Telerik UI for Blazor and Telerik Document Processing are used in the same project.

Error Message

Error NU1107: Version conflict detected for Telerik.Zip. Install/reference Telerik.Zip ... directly to project ... to resolve this issue.

Warning NU1605: Detected package downgrade: Telerik.Zip from ... to .... Reference the package directly from the project to select a different version.

Cause

Telerik.Zip is a transitive dependency of multiple other Telerik NuGet packages:

Telerik UI for Blazor (the Telerik.UI.for.Blazor NuGet package) depends on the Telerik.Documents.SpreadsheetStreaming NuGet package in order to support [Grid Excel export]({%slug grid-export-excel%}). Telerik.Documents.SpreadsheetStreaming depends on Telerik.Zip.
Most [Telerik Document Processing]({%slug dpl-in-blazor%}) NuGet packages depend on Telerik.Documents.Core, which also depends on Telerik.Zip.

Telerik UI for Blazor and Telerik Document Processing use different release cycles. As a result, the latest version of Telerik UI for Blazor may not be compatible with the latest version of Telerik Document Processing.

Error NU1107 Version conflict detected for Telerik.Zip occurs when an older Telerik UI for Blazor version is used together with a newer Telerik Document Processing version. As a result, Telerik.UI.for.Blazor expects an older Telerik.Zip version than what the project has resolved.

Warning NU1605 Detected package downgrade: Telerik.Zip occurs when a newer Telerik UI for Blazor version is used together with a older Telerik Document Processing version. As a result, Telerik.UI.for.Blazor expects a newer Telerik.Zip version than what the project has resolved.

Solution

There are several ways to fix the NuGet conflict errors:

[Upgrade Telerik UI for Blazor]({%slug upgrade-tutorial%}), if a newer version is available.
Downgrade Telerik Document Processing to the older version that Telerik.UI.for.Blazor expects for Telerik.Zip.
Reference the newer version of Telerik.Zip explicitly in the project.
Reference the newer version of Telerik.Documents.SpreadsheetStreaming explicitly in the project.

The ultimate goal is all Telerik NuGet packages in the app to use the same version of Telerik.Zip.

Upgrade or Downgrade NuGet Package Versions

Refer to the release notes for your Telerik UI for Blazor version.
Check the required and compatible version of Telerik Document Processing. For example, Telerik UI for Blazor 6.2.0 depends on Telerik Document Processing 2024.3.806.
Upgrade Telerik UI for Blazor. Alternatively, downgrade Telerik Document Processing.

Reference the Telerik.Zip Package Explicitly

Register the newer Telerik.Zip NuGet package version explicitly in the project, which will force Telerik UI for Blazor to use that version instead. The referenced Telerik.Zip version must match the version of the other Telerik Document Processing packages in the project. The resulting output in the .csproj file will be similar to the one below.

caption Project file

<ItemGroup>
    <PackageReference Include="Telerik.UI.for.Blazor" Version="AA.BB.CC" />
    <PackageReference Include="Telerik.Zip" Version="ZZ.YY.XX" />
    <PackageReference Include="Telerik.Documents.Spreadsheet" Version="ZZ.YY.XX" />
    <PackageReference Include="Telerik.Documents.Spreadsheet.FormatProviders.OpenXml" Version="ZZ.YY.XX" />
  </ItemGroup>

This approach will generate a NuGet Warning NU1608, but the application will be able to compile and run.

caption NuGet Warning NU1608

NU1608: Detected package version outside of dependency constraint: Telerik.Documents.SpreadsheetStreaming ... requires Telerik.Zip ... but version Telerik.Zip ... was resolved.

Reference the Telerik.Documents.SpreadsheetStreaming Package Explicitly

Register the newer Telerik.Documents.SpreadsheetStreaming NuGet package version explicitly in the project, which will force Telerik UI for Blazor to use that version instead. The referenced Telerik.Documents.SpreadsheetStreaming version must match the version of the other Telerik Document Processing packages in the project. The resulting output in the .csproj file will be similar to the one below.