iTunes cannot locate music on external hard drive

Hi, I recently decided to move my iTunes music to a secondary 1tb hard drive on my computer

I copied the iTunes folder contents to a new folder on my 1tb hard drive called "iTunes tb"

inside this folder contains: Album artwork, iTunes library extras.itdb, iTunes library genius.itdb, iTunes library.il, iTunes library.xml, iTunes music folder and previous iTunes libraries.

After copying my iTunes folder i changed the iTunes media location to /Volumes/1 TB Drive/iTunes TB/iTunes Music

I have pressed option key and rebuilt my library but for some reason -

I could not play any music I get this message "could not be used because the original file could not be found."

Thanks, any help would be appreciated.