human
Solve the following python programming problem given the following code:
def __call__(self, environ, start_response) : 
    def replacement_start_response(status, headers, exc_info = None) : 
        '
            Overrides the default response if the status is defined in the
            Pecan app error map configuration.
            ' 
        try : 
            status_code = int (status.split (' ') [0]) 
except (ValueError, TypeError) : 
            raise Exception (('ErrorDocumentMiddleware received an invalid status %s' % status)) 
if (status_code in self.error_map) : 
            def factory(app) : 
                return StatusPersist (app, status, self.error_map [status_code]) 
raise ForwardRequestException (factory = factory) 
return start_response (status, headers, exc_info) 
app_iter = self.app (environ, start_response) 
    return app_iter 

    
    

    Fix the buggy line: app_iter = self.app (environ, start_response)
assistant
#Here is Python program to fix the buggy line: app_iter = self.

app_iter = self.app (environ, def replacement_start_response()