The operation can’t be completed because the original item for “Foo” can’t be found
Apparently this problem can occur for many different reasons.  In my case it was solved by re-launching the finder.  A description and solution for this was at http://www.cnet.com/news/fix-shared-computer-not-found-in-finder/ .


  To fix this problem, you simply need to relaunch the Finder, and it will re-populate the list of shared devices. To do this, you can do one of the following:
  
  
  Hold the Option key and right-click the Finder icon in the Dock, then select Relaunch.
  Press Option-Command-Escape or choose Force Quit from the Apple menu, then select the Finder and click Relaunch.
  Log out and log back in to your user account.