Adding windows update to an offline wim but getting an error

Using the following example to add updates to a WIM file.
Usinge MDT 2010 Update 1

mount the wim:  Dism /mount-wim /winmile:"path to wim" /index:1 /mountDir:"mountfolder"
Add patches:  Dism.exe /image:"path to mounted wim" /add-package /packagePath:"path to msu ot cab"
Unmount and commit changes:  dism /unmount-wim /mountdir:"path to mounted wim" /commit

Mount works fine

But when I run the command to add patches I get:

Error: 87
No Packages were found that require processing.

I am using the package path to our WSUS server.    X:\wsus\wsuscontent\

This is where we have all our updates for workstations and servers.

And I know their are almost 200 Windows 7 updates in there.

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