At the moment I'm not able to reproduce the issue, and it has happend two times of just a few tries with Alfred V2.02 (each time I have been unable to solve the issue by retrying or trying to send another file). I'm using OS X mountain lion with newest version of Apple mail (V6.3). I'm not running anything unusual, but ill report back with more information, next time the issue occur
Not that familier with console, and can't point out the error atm, but ill check it next time.