It's been a while that you asked this question, but it seems that no solution came up in this thread.
Depending on the way you create a user-crontab, it might be necessary to execute this after editing it:
crontab ~/.yourcrontabfile
crontab ~/.yourcrontabfile
To see if the new crontab (also after modifying it) has been activated, check with:
crontab -l
crontab -l