[Solved] Error MSB4062: The "Telerik.Licensing.Tasks.ResolveTelerikProducts" task could not be loaded from the assembly

[Telerik Admin]

We have identified a licensing issue caused by the upgrade to VS2026 18.4.0 and .NET 10.0.200. Our team is actively working to resolve the problem. Any further updates will be shared in this public item to ensure better visibility.

A potential workaround in the meantime is to roll back to VS2026 v18.3.2.

[Hristian Stefanov]

Hi all,

If you continue to encounter this error, use Telerik.Licensing v1.8 and do a full Clean and Rebuild:

<Project Sdk="Microsoft.NET.Sdk.BlazorWebAssembly">

  <PropertyGroup>
    <TargetFramework>net10.0</TargetFramework>
    <Nullable>enable</Nullable>
    <ImplicitUsings>enable</ImplicitUsings>
    <OverrideHtmlAssetPlaceholders>true</OverrideHtmlAssetPlaceholders>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly" Version="10.0.5" />
    <PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly.DevServer" Version="10.0.5" PrivateAssets="all" />
    <PackageReference Include="Telerik.Licensing" Version="1.8.2" />
  </ItemGroup>

</Project>

If you cannot update for some reason, or there are complications:

1. You can apply the same fix on your project by adding this Directory.Build.targets file in the same directory as your .csproj file with the following content:
   

   <?xml version="1.0" encoding="utf-8"?>
   <Project>
       <Target
           Name="ResolveTelerikReferences"
           Condition="$(ImportXamlTargets)!='true' Or !$(MSBuildProjectName.EndsWith('_wpftmp'))"
           DependsOnTargets="ResolveReferences"
           BeforeTargets="CoreCompile">
   
           <ResolveTelerikProducts
               Condition="'$(DotNetWatchBuild)' != 'true'"
               OutputPath="$(OutputPath)"
               IntermediateOutputPath="$(IntermediateOutputPath)"
               MSBuildProjectName="$(MSBuildProjectName)"
               MSBuildProjectDirectory="$(MSBuildProjectDirectory)"
               MSBuildProjectExtension="$(MSBuildProjectExtension)"
               Language="$(Language)"
               Platform="$(Platform)"
               TargetFramework="$(TargetFramework)"
               TargetFrameworkVersion="$(TargetFrameworkVersion)"
               TargetFrameworks="$(TargetFrameworks)"
               VisualStudioVersion="$(VisualStudioVersion)"
               UsingMicrosoftNETSdk="$(UsingMicrosoftNETSdk)"
               UsingMicrosoftNETSdkRazor="$(UsingMicrosoftNETSdkRazor)"
               UsingMicrosoftNETSdkWeb="$(UsingMicrosoftNETSdkWeb)"
               ImportXamlTargets="$(ImportXamlTargets)"
               OutputType="$(OutputType)"
               UseMaui="$(UseMaui)"
               UseTelerikTheming="$(UseTelerikTheming)"
               NuGetPackageRoot="$(NuGetPackageRoot)"
               PackageReferences="@(PackageReference)"
               ReferencePaths="@(ReferencePath)"
               TelerikLicensingVerbosity="$(TelerikLicensingVerbosity)"
               TelerikLicenseGen="$(TelerikLicenseGen)"
               TelerikLicenseDate="$(TelerikLicenseDate)"
               TelerikLicensingAlias="$(TelerikLicensingAlias)"
               TelerikLicensingStrict="$(TelerikLicensingStrict)"
               TelerikZeroDepsMetadataReader="$(TelerikZeroDepsMetadataReader)"
               TelerikForceZeroDepsMetadataReader="$(TelerikForceZeroDepsMetadataReader)">
               <Output TaskParameter="TelerikRuntimeLicense" ItemName="GeneratedCompile" />
               <Output TaskParameter="TelerikRuntimeLicense" ItemName="FileWrites" />
           </ResolveTelerikProducts>
   
           <ItemGroup Condition="'$(DotNetWatchBuild)' != 'true'">
               <PostGeneratedCompile Include="@(Compile)" />
               <Compile Remove="@(Compile)" />
               <Compile Include="@(GeneratedCompile);@(PostGeneratedCompile)" />
           </ItemGroup>
       </Target>
   </Project>

2. After that, run:
   - dotnet build
   - dotnet watch

Regards,
Hristian Stefanov
Progress Telerik