I would not recommend to redirect both the standard output and error output.
This is due to cronjob could to warn you about problems, and without them could turn your task to debug applications much more difficult.
You still didn t said where you put that commands.
If was in panel, try to cat the content directly from /etc/crontab here to us, or by show us the result of the command "crontab -l user" here.
The objective is to check if the panel is passing correctly the commands to corntab.
Regards,
Netino