@Kelvin1
The System.Exception is the base class for all the exceptions in .Net (UiPath too). It will catch every exception that happens.
You can also add specific exceptions as well. For example if you know that sometimes the application does not launch properly you can specify
UiPath.UIAutomationNext.Exceptions.ApplicationNotFoundException
This exception usually happens when application is not opened but you are trying to use it.
In case of any other exceptions, you can simply look it up in output panel (In the lower left corner of the UiPath Studio by default)after it happens:
