NuGet Error NU5025

The assets file found does not contain a valid package spec. Try restoring the project again. The location of the assets file is F:\project\obj\project.assets.json.

Issue

The project passed to the msbuild -t:pack does not contain a valid assets file in the obj directory.

Solution

Please run msbuild -t:restore -p:restoreforce=true operation on the project being packaged before running the pack operation.