It sounds like you and your co-worker are using different EG 7.x versions. ActionOnError refers to a feature that was added in EG 7.13, so I suspect you are using EG 7.13 or later and your co-worker is using 7.12, 7.11, or 7.1. It should be ok to ignore the error. However, if you regularly share projects, it is a good idea to be running the same version of EG. So, I suggest checking your EG versions (in Help->About) and upgrade whichever is behind, so you are both running the same version.
Casey
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