I am using a!startprocess function from an interface to save some data to db, now lets say the process model being called encounters a run time error in some node, i need to show the user some custom message like ' some error occured' in the interface , onError dosent work here , as there was no issue starting the process.
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Wait for a process response, as a variable.. and after that, with refresh variables, control the behavior of the interface, and depending on the value received from the process, show the message or not.