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Azure Pipelines error - NuGet.CommandLine.CommandLineException: Error parsing solution file

After installing the latest Visual Studio version on our build servers, some of our builds started to fail with the following error message:

This error only happened on the build servers running MSBuild version 16.5.0.12403:

One or more errors occurred. ---> NuGet.CommandLine.CommandLineException: Error parsing solution file at D:\b\4\agent\_work\153\s\VLM.MELO.sln: Exception has been thrown by the target of an invocation. at NuGet.CommandLine.MsBuildUtility.GetAllProjectFileNamesWithMsBuild(String solutionFile, String msbuildPath) at NuGet.CommandLine.RestoreCommand.ProcessSolutionFile(String solutionFileFullPath, PackageRestoreInputs restoreInputs)

This turns out to a bug in the NuGet client where older versions have trouble with this new version of MSBuild.

To resolve this issue in Azure Pipelines, add a NuGet Tool Installer task to your pipeline before any tasks that use NuGet, and set the version field to include the latest version.

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