mysql replication

[tera7]

Hello i try to do a database replication as i described at:

http://www.howtoforge.com/mysql_database_replication


but when i type this to mycnf

log-bin = /var/log/mysql/mysql-bin.log
binlog-do-db=exampledb
server-id=1


the mysql doesnt start

Ofcourse i have the right values at these fields.
Any suggestion?
Thank you.