What does the error "MethodNotAllowed" mean when attempting to install Nuget packages from the GitHub Package Feed?

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The "MethodNotAllowed" error typically occurs when trying to perform an action that is not allowed or supported by the server. In the context of installing Nuget packages from the GitHub Package Feed, this could mean that the package source URL or the Nuget client configuration is incorrect or incomplete. It could also indicate that the GitHub Package Feed does not support the specific version or type of package being requested. To resolve this error, check the configuration settings and try again, ensuring that the correct package source URL and authentication credentials are specified.