We made the switch to Visual Studio 2017 and having trouble with our self-hosted build agent that gets its work from VSTS.
One VSTS-build step is building all solutions with "Visual Studio Build: Build Solution ***.sln" using "Visual Studio Version: Visual Studio 2017".
The following error happens for all our projects where "ASP.NET Core Web Application (.NET Core)" was the chosen project type.
C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\MSBuild\Sdks\Microsoft.NET.Sdk.Publish\build\netstandard1.0\TransformTargets\Microsoft.NET.Sdk.Publish.TransformFiles.targets(54,5): error MSB4062: The "TransformWebConfig" task could not be loaded from the assembly C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\MSBuild\Sdks\Microsoft.NET.Sdk.Publish\build\netstandard1.0....\tools\net46\Microsoft.NET.Sdk.Publish.Tasks.dll. Could not load file or assembly 'file:///C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\MSBuild\Sdks\Microsoft.NET.Sdk.Publish\tools\net46\Microsoft.NET.Sdk.Publish.Tasks.dll' or one of its dependencies. An attempt was made to load a program with an incorrect format. Confirm that the declaration is correct, that the assembly and all its dependencies are available, and that the task contains a public class that implements Microsoft.Build.Framework.ITask.
Additional information:
- From within Visual Studio 2017 the solutions built without any errors.
- None of our projects include any .config transformations files (but do include .config files like web.config), still the error occurs.
- Visual Studio 2017 Build Tools as well as full Visual Studio 2017 have been installed on the build server and e.g. .NET Core Class Libraries compile fine.
- Installed .NET Core versions are identical between build server and developer machines.
- The same errors also happen when using "MsBuild: Build Solution ***.sln" as a build step for all solutions and selecting "MSBuild: MSBuild 15.0".
- The file mentioned as "Could not load file or assembly: C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\MSBuild\Sdks\Microsoft.NET.Sdk.Publish\tools\net46\Microsoft.NET.Sdk.Publish.Tasks.dll" does exist in the mentioned path.
- No tasks are defined within the .csproj files.
Anyone got any insight as to what might cause this?