appearance of red cross before every torrent file

when i formatted my system,i saved some half downloaded torrent file .when i tried to continue download ,it was not taken by bit comet .
After that my friend tried and end up in making torrent afetr that i reinstalled bit comet,deleted xml file but now it gives a rd cross before every new torrent also and shows message
"" Stopped[Error:The system can't find the file specified]"


please tell me how it can be fixed????