Unable to enter directories in Finder after moving directories to NAS
From the symptoms you describe I suspect a damaged .DS_Store file in the parent folder. 

Try deleting it while the folder is closed in the Finder. Close all open windows in the Finder, then in Terminal rm .DS_Store while in the directory. This should be the same directory you were in when you ran the command in your question. Now open . will open the directory in the Finder and all should be OK. If that doesn't work you could also try deleting the .DS_Store in the directory above.

If neither of those work then I would try copying the entire folder tree in Terminal using the cp command.