[CentOS] tar exclude command

Hi 

I have problem in tar command

Can you help?

tar -cv --exclude /var/named/chroot/proc/* -zf backup.tar.gz /var/named 

/var/named/chroot/proc/net/route
/var/named/chroot/proc/net/udp
/var/named/chroot/proc/net/tcp
tar: Error exit delayed from previous errors

Thank you

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