Shell Initialization Errors in Commerce Manager When Updated to v10

Here is the following exception you may encounter upon upgrade:

Value cannot be null.Parameter name: virtualPath]in EPiServer.Shell.ShellInitialization.WaitForInitializeModules()

You may have the following dlls in the /bin folder:

EPiServer.Cms.Shell.UI.dll
EPiServer.UI.dll
EPiServer.Shell.UI.dll
EPiServer.Shell.dll
EPiServer.Cms.UI.AspNetIdentity.dll

If you have these dlls in bin:

EPiServer.Cms.Shell.UI.dll
EPiServer.UI.dll
EPiServer.Shell.UI.dll
EPiServer.Shell.dll
EPiServer.Cms.UI.AspNetIdentity.dll

Remove them from the bin folder and you should be able to access Commerce Manager.