NuGet Error NU5042
`project.json` pack is disabled in the current NuGet version, and will be permanently removed in a future version. Please consider migrating 'MyProject' to `PackageReference` and using the pack targets. You can set the 'NUGET_ENABLE_LEGACY_PROJECT_JSON_PACK' environment variable to 'true' to temporarily reenable this functionality.
Issue
NuGet.exe pack for project.json projects is not supported.
Solution
Migrate your project to PackageReference and use the pack targets instead.
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