Noticed at https://github.com/checkstyle/contribution/pull/746/files#r1060109071, we are using an old version of codenarc. Latest release is 3.1.0, we are using 1.4/1.5 right now.

https://github.com/CodeNarc/CodeNarc/releases

Edit: we cannot use the latest due to older groovy version used in CI and the groovy syntax used in our scripts. We have settled on 2.2.0