RSTickets! Pro menu items disappear

I accessed an RSTickets! Pro menu item and the rest of the component specific menus disappear.

RSTickets!Pro provides an option on this matter and you will need to go to RSTickets! Pro > Configuration > General and search for the "Attempt to calculate Item IDs" option. If the option is not found in the given area, then please try updating RSTickets!Pro by using the method explained here.

After updating the component, please go again to RSTickets! Pro > Configuration > General and now you will find the option "Attempt to calculate Item IDs". Please try setting the option to No and test the menu item functionality again. Everything should be working correctly after this.