I have a process definition which whenever my web app client sends a specific request to my server, I start an instance of it. In this process, I have a service task that I have implemented it using javascript SDK. In this service task under some conditions, I throw a BPMN error like this:

export const checkTimePeriod = () => {
 client.subscribe("checkTimePeriod", async function ({ task, taskService }) {
  const requestTime = task.variables.get("requestTime");

  if (requestTime < 20) {
     // complete the task
     await taskService.complete(task);
  } else {
    const errorMessage = "Not in allowed time period";
    await taskService.handleBpmnError(task, errorMessage);
  }
});
};

Now since this is a callback and runs whenever my process reaches this state, how can I get this error in my own code in the upper function? Thanks.