I  have this error message appearing on my newly downloading torrents: "Can't find local data. Try 'Set Location' to find it, or restart the torrent". 
No Data found! Ensure your drives are connected or use "Set Location". To re-download, remove the torrent and re-add it 
I am using Transmission Remote GUI on a Windows 7 system to access  optware bedded router.
During download torrent files, it appears suddenly all files downloading been stopped.

Solution:

  • upgrade transmission remote GUI from 2.9 to 3.2 ( no avail)
  • remove torrent files,  re-download & re-update it  ( no avail)
  • noticed that while downloading file, the default directory was changed to / from /mnt/torrent/work. thats what caused all files downloads stop.