ENDIAN Firewall - Error Squid

Hello All,

When i check my log i see many warning on squid
cat /var/log/squid/squid.out

2013/10/09 15:13:22| WARNING: because of this '66.220.153.11' is ignored to keep splay tree searching predictable
2013/10/09 15:13:22| WARNING: You should probably remove '66.220.153.11' from the ACL named 'to_rule0'
2013/10/09 15:13:22| WARNING: '69.63.181.31' is a subnetwork of '69.63.181.31'
2013/10/09 15:13:22| WARNING: because of this '69.63.181.31' is ignored to keep splay tree searching predictable
2013/10/09 15:13:22| WARNING: You should probably remove '69.63.181.31' from the ACL named 'to_rule0'
2013/10/09 15:13:22| WARNING: '66.220.153.11' is a subnetwork of '66.220.153.11'
2013/10/09 15:13:22| WARNING: because of this '66.220.153.11' is ignored to keep splay tree searching predictable
2013/10/09 15:13:22| WARNING: You should probably remove '66.220.153.11' from the ACL named 'to_rule0'
2013/10/09 15:13:22| WARNING: '66.220.153.11' is a subnetwork of '66.220.153.11'
2013/10/09 15:13:22| WARNING: because of this '66.220.153.11' is ignored to keep splay tree searching predictable
2013/10/09 15:13:22| WARNING: You should probably remove '66.220.153.11' from the ACL named 'to_rule0'
2013/10/09 15:13:22| WARNING: '69.63.176.49' is a subnetwork of '69.63.176.49'
2013/10/09 15:13:22| WARNING: because of this '69.63.176.49' is ignored to keep splay tree searching predictable
2013/10/09 15:13:22| WARNING: You should probably remove '69.63.176.49' from the ACL named 'to_rule0'

I don't know where is the file ACL named "to_rule0". Could any body please help me?

Thanks & Regards,