Try these steps:
- removed all packages under /packages folder except nopCommerceCustom
- Under nopCommerceCustom. right click and unblock those 2 assemblies in there
- Open VS, load the solution, right click on the solution or project, and Manage Nuget Package for solution.
- You should see "Restore" in the top corner, then click on Restore.
- Wait, will take a couple of minutes
- Once done, rebuild, should be good now, since those packages are your own solution packages .