https://answers.axonivy.com/questions/1554/how-to-catch-exception-with-task-switch-gateway-component<p>Hi all,</p> <p>When I started the task in the task list. I often got the exception: </p> <p><strong>RequestException: The task with identifier '846' was already finished or does not exist (Session identifier is '45').</strong></p> <p>But I want to catch this exception and show a friendly dialog to the user.</p> <p>I am looking forward to hearing any ideas from you</p> <p>Vuong Vu, Vision team</p>enFri, 13 Nov 2015 16:28:51 -0500https://answers.axonivy.com/questions/1554/how-to-catch-exception-with-task-switch-gateway-component/1557<p>With Axon.ivy 6.0 there will be a better error messsage for this problem. If the task was already done by another person the name of the person is visible in the error page.</p>Reto WeissFri, 13 Nov 2015 16:28:51 -0500https://answers.axonivy.com/questions/1554/how-to-catch-exception-with-task-switch-gateway-component/1557https://answers.axonivy.com/questions/1554/how-to-catch-exception-with-task-switch-gateway-component/1556<p>Instead of linking the task directly you could execute dialog logic when a user tries to resume a task. Within this dialog logic you check if the task still has the correct state. (E.g. by using the workflow api: TaskQuery.create()....) If the task state is correct, you redirect to the real task-pickup URL, otherwise you show a nice dialog, that somebodey else finished the task.</p>Reguel WermelingerFri, 13 Nov 2015 15:26:13 -0500https://answers.axonivy.com/questions/1554/how-to-catch-exception-with-task-switch-gateway-component/1556