NuGet pack Unable to cast object of type 'System.String' to type 'NuGet.Frameworks.NuGetFramework Came across a rather misleading error message above today while attempting to pack and publish a .Net Standard class library project to a private feed as a DevOps Artifact. Well, it turns out that the NuGet Pack and NuGet Push are not supported by NuGet 4.x at this time. The workaround is to use the .Net core specific build tasks which include commands for pack and publish as show below: At Assemblysoft we specialise in Custom Software Development tailored to your requirements. We have experience creating Booking solutions, as we did for HappyCamperVan Hire. You can read more here . We can onboard and add value to your business rapidly. We are an experienced Full-stack development team able to provide specific technical expertise or manage your project requirements end to end. We specialise in the Microsoft cloud and .NET Solutions and Services . Our develop