installGlobalErrorHandler method 
    
      
void
installGlobalErrorHandler(
[ - bool force = false
]) 
    
    
  Implementation
  void installGlobalErrorHandler([bool force = false]) {
  if (_isInstalled && !force) {
    return;
  }
  final defaultOnError = FlutterError.onError;
  FlutterError.onError = (FlutterErrorDetails errorDetails) async {
    Object exception = errorDetails.exception;
    StackTrace? stack = errorDetails.stack;
    if (_isActive) {
      await logException(exception, false, stack);
    }
    // call original handler
    if (defaultOnError != null) {
      defaultOnError(errorDetails);
    }
  };
  _isInstalled = true;
}