This means that your system is an out of date version of modsecurity that does not support 2.9.0 and higher rule syntax.
Solutions:
1) Upgrade to ASL. ASL will automatically ensure you have the latest version of modsecurity installed on your system.
2) If you do not wish to upgrade to ASL, and can not upgrade to 2.9.0, you will need to remove the ruleset(s) that are generating this error.
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