[question]: Error MT1035: Cannot include different versions of the framework 'OneSignal.framework' ?

[robfrancis]

How can we help?

Hey,

I'm getting the following error when building my Xamarin Forms iOS project in App Center after upgrading from OneSignal v3 to v4.
Has anyone experienced this issue?

error MT1035: Cannot include different versions of the framework 'OneSignal.framework' [...MyProject.iOS.csproj]
error MT1036: Framework 'OneSignal.framework' included from: /Users/runner/.nuget/packages/onesignalsdk.xamarin/4.3.4/res/iOS/OneSignal.xcframework/ios-arm64_armv7_armv7s/OneSignal.framework (Related to previous error) [/Users/runner/work/1/s/MyProject/MyProject.iOS/MyProject.iOS.csproj]
error MT1036: Framework 'OneSignal.framework' included from: /Users/runner/work/1/s/MyProject/packages/OneSignalSDK.Xamarin.4.3.4/res/iOS/OneSignal.xcframework/ios-arm64_armv7_armv7s/OneSignal.framework (Related to previous error) [/Users/runner/work/1/s/MyProject/MyProject.iOS/MyProject.iOS.csproj]

I would appreciate any advice.
Thanks.

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[robfrancis]

This issue occurred as a result of upgrading the OneSignal.Xamarin package in my iOS ServiceExtensions project.

When upgrading from v3 to v4 it was adding the following to the .csproj

<ItemGroup>
  <Reference Include="OneSignal.iOS.Binding, Version=0.0.0.0, Culture=neutral, processorArchitecture=MSIL">
    <HintPath>..\packages\OneSignalSDK.Xamarin.4.1.3\lib\Xamarin.iOS\OneSignal.iOS.Binding.dll</HintPath>
  </Reference>
  <Reference Include="OneSignalSDK.Xamarin, Version=0.0.0.0, Culture=neutral, processorArchitecture=MSIL">
    <HintPath>..\packages\OneSignalSDK.Xamarin.4.1.3\lib\Xamarin.iOS\OneSignalSDK.Xamarin.dll</HintPath>
  </Reference>
  <Reference Include="OneSignalSDK.Xamarin.Core, Version=0.0.0.0, Culture=neutral, processorArchitecture=MSIL">
    <HintPath>..\packages\OneSignalSDK.Xamarin.4.1.3\lib\Xamarin.iOS\OneSignalSDK.Xamarin.Core.dll</HintPath>
  </Reference>
</ItemGroup>
<ItemGroup>
  ...
  <None Include="packages.config" />
  ...
</ItemGroup>
<Import Project="..\packages\OneSignalSDK.Xamarin.4.1.3\build\Xamarin.iOS\OneSignalSDK.Xamarin.targets" Condition="Exists('..\packages\OneSignalSDK.Xamarin.4.1.3\build\Xamarin.iOS\OneSignalSDK.Xamarin.targets')" />
<Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
  <PropertyGroup>
    <ErrorText>This project references NuGet package(s) that are missing on this computer. Enable NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105.The missing file is {0}.</ErrorText>
  </PropertyGroup>
  <Error Condition="!Exists('..\packages\OneSignalSDK.Xamarin.4.1.3\build\Xamarin.iOS\OneSignalSDK.Xamarin.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\OneSignalSDK.Xamarin.4.1.3\build\Xamarin.iOS\OneSignalSDK.Xamarin.targets'))" />
</Target>

I needed to replace this chunk of code with

<ItemGroup>
    <PackageReference Include="OneSignalSDK.Xamarin" Version="4.3.4" />
</ItemGroup>

This resolve my issue completely.

[emawby]

Thank you for reporting! I am glad you were able to find the issue

[devperson]

Thanks @robfrancis I had the same issue and your solution worked for me as well