Bopm Lookup error (I Know this was asked many times ..)

Hi guys,
I have this Lookup error if BOPM is scanning any connection.
Looks like:
[14:41:45] [BopmServ] DNSBL -> Lookup error on 
210.61.97.213.opm.blitzed.org: Unknown error
But this BOPM detects HTTP Proxys.
in /etc/resolv.conf are this contents:
nameserver 81.169.163.106
nameserver 194.25.2.129
I already tried it with firedns.conf in the bopm/etc directory and with 
other NameServ ip's. But the same error happens.
Can somebody help me? Because my server get flooded by proxys everyday.