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title NuGet Warning NU1504
description NU1504 warning code
author nkolev92
ms.author nikolev
ms.date 03/31/2022
ms.topic reference
f1_keywords
NU1504

NuGet Warning NU1504

Scenario 1

Duplicate 'PackageReference' items found. Remove the duplicate items or use the Update functionality to ensure a consistent restore behavior. The duplicate 'PackageReference' items are: X 1.0.0, X 2.0.0.

Issue

Sometimes when adding PackageReference items, you may end up adding an item for a particular package multiple times.

Example:

<ItemGroup>
  <PackageReference Include="X" Version="1.0.0" />
</ItemGroup>
...
<!-- Somewhere else in the project file, or another MSBuild file-->
<ItemGroup>
  <PackageReference Include="X" Version="2.0.0" />
</ItemGroup>

This can cause an inconsistent restore behavior.

Solution

Consult the recommendations in the warning message and do one of the following:

  • Remove the duplicate items
  • Use item Update instead of item Include