[Dovecot] best way something thinks to upgrade dovecot to 1.2.* 2.0.*

hello all hello dovecot network hello timo

What are your tips for successful migration for dovecot (atrpms , atrpms-testing depot for centos ) the page of wiki http://wiki2.dovecot.org/Upgrading/2.0 explains the method to upgrade

I tried on my personal machine and the command cites wiki returns errors on the terminal what to do with errors: correct the error in the configuration file ?

the question may seem simple but it is not pointless

many returns are welcome something thinks are welcome

thanks