# Rule failed error **URL:** \ **Category:** Feedback & Support\ **Created:** [February 24, 2025, 6:56am UTC](https://community.emergingthreats.net/t/rule-failed-error/2471 "2025-02-24T06:56:58Z")\ **Posts on this page:** 1\ **Showing post:** 2
**Author:** ![bingohotdog](https://sea2.discourse-cdn.com/flex016/user_avatar/community.emergingthreats.net/bingohotdog/32/42_2.png) [@bingohotdog](https://community.emergingthreats.net/u/bingohotdog)\ **Post date:** [February 24, 2025, 6:58pm UTC](https://community.emergingthreats.net/t/rule-failed-error/2471/2 "2025-02-24T18:58:29Z")
Hi @EMTUser, Thank you for reporting this. The error details mention “Unknown rule option: ‘byte\_math’” which indicates the Snort Engine running does not have this keyword available. You may want to compare your Snort Engine version against our supported Snort engines here ([Announcing legacy Snort version support conditions](https://community.emergingthreats.net/t/announcing-legacy-snort-version-support-conditions/1812)). Any version older than snort-2.9.13 is not supported by our rule set. The rule’s logic relies on the available Snort byte\_math keyword and so, the rule will remain as is until further notice. At this time, disabling the rule maybe the suitable next step. Cheers, 🌭 --- _[View the full topic](https://community.emergingthreats.net/t/rule-failed-error/2471)._