Nice, then just click on the relevant make workflow, afterwards on the right hand side you'll find the previous executions, click on the execution with the red error label. Once inside the specific exec., click on the module with the red bubble on top to get the error message. If there's no execution with an error label you most likely don't have a webhook response node configured within your scenario. If so, this is required by Vapi to make sure the tool call was successful. Add that module at the end of the scenario with the JSON payload as specified by the tool call Vapi docs. Hope that helps