I would suggest uninstalling and reinstalling Visual Studio and the .NET Framework. If that doesn't help, you would need to open a support incident with Microsoft, the maker of MSBuild, for problems with MSBuild. You can check the 'Log the command-line...' checkbox on the Advanced tab, rebuild the step, then copy and paste the msbuild command-line from the build output to a Command Prompt to reproduce outside of VBP and provide to MS support.
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