This error occurs when an incorrect event specified(%s) at definition level or the event is not a valid event for the scope(%s).
Ensure that the spelling for the event is correct and the event is a valid event.
On: Form Accept: Yes: Display: Balance Sheet
In the above example, the event Form Accept is not a valid system event. Hence the message error T0035: The event 'Form Accept' is invalid or not valid at Events scope.
The code is corrected by adding a valid system event.
On: System End: Yes: Display: Balance Sheet