It's very clear, the server cannot connect to the database.
Alright, go to your /etc/babel/babel_server.conf
take a look at this fields:
and now do this:
mysql -u user_name -p -h hostname -D db_name
Change user_name, hostname and db_name for the values you have in the babel_agent.conf (the password will be asked once you press return)
Can you log into the database using that? Probably not :-)