Error "error in ACL: unknown ACL condition/modifier in "spam = ${acl_m1}/defer_ok"

[Edward]

Hi LavenderHost

1. Did yuu tried upcp --force ?
2. Did you tried yum update after changing all external repos like epel, rpmforge etc ?
3. What is the version of Cpanel ? Is it latest one ?
4. Was there any recent changes made ?
5. Did you checked yum.log and see if there is any recent auto Os updates done as most companies add auto os updates now a days ?
6. Also if it is an issue with RPM , then the below command should fix or reinsstall
/usr/local/cpanel/scripts/check_cpanel_rpms --fix

Let me know if any of these works for you