Unable to save my edited photos on my desktop

Currently having trouble with the hard drive that would normally be used for saving my finished work.  My computer is not able to communicate with the hard drive at the moment.  I still have access to all my photos though thanks to the cloud.  My problem is that it will not let me save to a different hard drive.  If I click the "Save to" button I get the following message. 

"Unexpected error performing command: bad argument #1 to 'stringbyappendingPathComponent' (string expected, got nil)"

I have no option but to click ok.  I have tried reinstalling lightroom, which did nothing.   Do I need to completely unistall and reinstall all of my adobe programs?  Any other solutions?