crontab does not work anymore

[claudiu]

I have a big problem with crontab in ubuntu dapper.
Recently I accidentally did:

	$ sudo crontab /etc/crontab

and I started receiving this by email, instead of the usual reports:

	/bin/sh: root: command not found

I noticed that /etc/crontab MAY have user name in it, not like ".crontab" 
files. Anyway, I erased root's crontab by doing:

	sudo crontab -r

And now I don't receive any emails at all.
I need to know how to fix this ASAP!!!! 
Thank you!