Hi @Justin,
Welcome to Microsoft Q&A!
How did you build your project?
Please try to add the assembly into the global assembly cache:
gacutil /i Microsoft.Build.Utilities.v4.0.dll
Meanwhile, please install the latest version of NuGet.Build.Tasks in package manager:
NuGet\Install-Package NuGet.Build.Tasks -Version 6.4.0
Sincerely,
Anna
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