OnDispatchFailed<TState>  typedef 
 
        OnDispatchFailed<TState> =
     Event Function(Context<TState>  context, Event event, TState initialState, dynamic error, StackTrace stackTrace)
     
    
An error occured while dispatching the event.
The initialState is the state before the execution.
Implementation
typedef Event OnDispatchFailed<TState>(
  Context<TState> context,
  Event event,
  TState initialState,
  dynamic error,
  StackTrace stackTrace,
);