Changed folders on WD MBL, now - "No movie files on current device"?

I inherited a WD MBL from a friend and decided to categorize his Movie folder into action, drama, comedy etc. I connect to my Samsung via a Blu Ray as the wi-fi connection keeps dropping. Anyhow, since categorising the folders, the following error message comes up on the TV screen - “No media files on current device. Select another category”. The thing is when I check on my computer all of the files are there and I can play them from the WD MBL (once again using an Ethernet to connect cos its faster). Anyone have any ideas on what’s going on and how I can get back to watching the movies on my TV? Cheers

Try to reset the media player that you are using… it might have some cache with the previews location of the files.