at & growlnotify

does anybody use at (http://developer.apple.com/documentation/Darwin/Reference/ManPages/man1/at.1.html) and Growl's (http://growl.info/) CLI util growlnotify together?

i type something like:
echo 'growlnotify -m "test"'| at 0015
but my notification comes only on 0018, i.e., it lates for 2-3 minutes. also, i receive the new mail (in /var/mail/username, of course), stating that:
2006-04-15 00:18:15.226 growlnotify[819] could not find local GrowlApplicationBridgePathway, falling back to NSDNC?

i'm using latest Growl 0.7.4 (but it was the same with the old one 0.7.2, which was installed before).


i would be grateful if someone could help me in fixing this problem, thanks.