The Component element contains an unhandled extension element

[dave-schmitz1]

We recently upgraded our WiX solution from version 3.11 to use 5.0.0. The upgrade went smoothly except for one small snag, I can no longer build the solution successfully in Visual Studio. I can however build this fine using command line dotnet build <solutionfile> along with the -f:net472 flag. The error I see in Visual Studio is the same I'm seeing in command line if I omit the -f:net472 flag.

The Component element contains an unhandled extension element 'RemoveFolderEx'. Please ensure that the extension for elements in the 'http://wixtoolset.org/schemas/v4/wxs/util' namespace has been provided

I've included a simplified snippet of code from my .wxs file that is causing this error with this at the beginning right after my include block
<Wix xmlns="http://wixtoolset.org/schemas/v4/wxs" xmlns:util="http://wixtoolset.org/schemas/v4/wxs/util">

And this inside a ComponentGroup/Component block
<util:RemoveFolderEx On="uninstall" Property="UNINSTALLLOCATION"/>

Is there a way to address this so Developers can use Visual Studio to build again or is building with the command line my only recourse?

[robmen]

Did you add the PackageReference to the Util extension as per doc?

[dave-schmitz1]

Yes, i have two package references in the wixproj file

<PackageVersion Include="WixToolset.UI.wixext" Version="5.0.0" />
<PackageVersion Include="WixToolset.Util.wixext" Version="5.0.0" />

[robmen]

There must be something strange in your .wixproj or .sln. The -f:net472 requirement is strange too. None of that is needed typically.

[dave-schmitz1]

@robmen there's nothing really special with my .sln file or our .wixproj other than we had to create a dummy sdk-style csproj file to load package reference dependencies so restore would occur before building the .wixproj since they do not operate the same way as a sdk-style. The other thing of note in my wixproj below is we are using centralized package management which is why the package versions are not included. Please let us know if there is anything else you would like to see.

<Project Sdk="WixToolset.Sdk/5.0.0">
  <PropertyGroup>
    <ProductVersion>3.9</ProductVersion>
    <OutputName>$(SetupDisplay)</OutputName>
    <OutputPath>bin\$(Configuration)\</OutputPath>
  </PropertyGroup>
  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|x86' ">
    <IntermediateOutputPath>obj\$(Platform)\$(Configuration)\</IntermediateOutputPath>
    <DefineConstants>Debug</DefineConstants>
    <SuppressIces>ICE90</SuppressIces>
  </PropertyGroup>
  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|x86' ">
    <IntermediateOutputPath>obj\$(Platform)\$(Configuration)\</IntermediateOutputPath>
    <SuppressIces>ICE90</SuppressIces>
  </PropertyGroup>
  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|x64' ">
    <DefineConstants>Debug</DefineConstants>
    <IntermediateOutputPath>obj\$(Platform)\$(Configuration)\</IntermediateOutputPath>
    <SuppressIces>ICE90</SuppressIces>
  </PropertyGroup>
  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|x64' ">
    <IntermediateOutputPath>obj\$(Platform)\$(Configuration)\</IntermediateOutputPath>
    <SuppressIces>ICE90</SuppressIces>
  </PropertyGroup>
  <PropertyGroup>
    <TargetFrameworks>net472</TargetFrameworks>
    <AssetTargetFallback>$(AssetTargetFallback);net472</AssetTargetFallback>
  </PropertyGroup>
  <ItemGroup>
    <Content Include="Settings.wxi" />
  </ItemGroup>
  <ItemGroup>
    <PackageReference Include="WixToolset.Util.wixext" />
    <PackageReference Include="WixToolset.UI.wixext" />
  </ItemGroup>
  <ItemGroup>
    <Folder Include="Components\" />
  </ItemGroup>
  <ItemGroup>
    <ProjectReference Include="Dependency\Dependency.csproj"
                      ReferenceOutputAssembly="false"
                      SkipGetTargetFrameworkProperties="true" />
  </ItemGroup>
</Project>

[robmen]

Remove TargetFrameworks.

[dave-schmitz1]

Thanks @robmen that seemed to do the trick.