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Sangreeno, thank you for your suggestion.  I had previously restarted both Lightroom and Photoshop before asking for help.  I did just try your suggestion and received the same error message.  This only occurs when using files from one of my external hard disks and not the others.  One would think it was a hard drive issue but Lightroom and Photoshop recognize all the hard drives and will access them directly just not when using the [Cmd + E] command in Lightroom.  It is frustrating!  Again, thank you for your suggestion.