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onerror label

Causes the Gosub at label to be executed or Subroutine to be called when an runtime error occurs. Program control may be resumed at the next statement with a Return statement in the subroutine. Error traps are kept in a stack so that the last defined trap, that has not been removed with an OffError will be the active one.

You may not execute an OnError statement inside a Try / Catch / End Try statement.

See example of usage on Error Codes and ThrowError pages.