First you need to associate this error-WF via Settings, and I did’nt see how to set the error.message with a custom value
Now imagine a generic error-WF is used (to send an email for example), and we want to call it explicitly when an unexpected result is found (even applicative), so not only for a WF internal error.
How could we do ? can I “call” an error-WF ? or do I have to use the Execute-WF node ? easy to pass $json ?