Alerts in Calendar does not work

Hi guys,

i am about to scheduled task weekly. I created a new event with the specific date and time and set the weekly basis. As an alert I set to open the file at the time of event. Everything looks good but that alert which is supposed to open my app will disappear after few seconds. I don't know why. The rest stay as was set. Also I set up alert as an email or sound alert it works properly as well. Just seems not working while using open app as an alert.

Any ideas what it could be?