What is this flow error?

If you receive an emailed flow error that references one of our custom objects (CANNOT_EXECUTE_FLOW_TRIGGER or similar), it's most likely originating from a custom flow you have running off one of our records.

Please review that flow. We don't recommend (or support you in building) custom automation that triggers off our objects, as they often conflict with our integration. But if you need to add it, please be sure all automation runs asynchronously. See Salesforce support or Trailhead for more information on async paths in flows and code.