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Package 'SamplePackage v1.0.0' from source 'https://contoso.com/index.json': The primary signature does not have a signing certificate.
Issue
NuGet client tried to verify a package signature with a SignerInfo entry that does not contain a signing certificate.
Solution
Please request the package author to re-sign the package using the nuget sign command as described in NuGet docs. If the problem persists, then please file an issue at NuGet/Home along with the package that generated this problem.
Note
When NuGet’s signature validation mode is set to accept (default), NU3010 is raised as a warning.
When NuGet’s signature validation mode is set to require, or when running the nuget verify -signatures command, NU3010 is elevated from a warning to an error.