instruments[34247:1345307] Attempting to set event horizon when core is not engaged, request ignored

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I get this error during ui automation and am unable to resolve it. This stops my automation flow ...

instruments[34247:1345307] Attempting to set event horizon when core is not engaged, request ignored

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Ian On

In my experience, this message is related to the startup or shutdown of the individual processes that enable UIAutomation; nothing in your javascript code or environment really has an effect on it. It's just a sporadic error that comes from somewhere in Apple's software.

Sometimes it happens at the beginning of the run (in which case your javascript code will never be executed), or at the end of the run (in which case your code has already run). If you are seeing this error at the end of a test run and your code did not fully execute, then the real error is probably happening sometime before this -- you are just seeing Apple's error as well on the test shutdown.