[Dovecot] problem with server certificate: dovectot.pem

Hi! I have an mail server with postfix and dovecot. All works fine, but now is change my domain. After changed configurations i can receive (or send) mail without STARTTLS, but when i try to use this option i receive: "TLS handshake failure. Invalid server certificate (Key material mismatch)"

I dont know what is this. I use certificate that is generate with script for dovecot (that work at begining). Even i try to rebuild this certificate acording with new domain but nothing. Where is my problem?

P.S. All works before changed my domain!!!