NuGet Warning NU1204
Invalid tools package Contoso.Tool 1.0.0. Tools packages cannot contain more than one PackageType.
Issue
The Contoso.Tool package has more than one package type. [DotnetTool](../../create-packages/set-package-type.md#known-package-types packages can only contain one PackageType.
Solution
Consult the with the package author and ask them to create a package with the DotnetTool package type only.