code: def error_response(self, kwargs_lens, kwargs_ps):
          
          model_error = self.error_map(kwargs_lens, kwargs_ps)
          error_map_1d = self.ImageNumerics.image2array(model_error)
          C_D_response = self.ImageNumerics.C_D_response + error_map_1d
          return C_D_response, model_error
docs: returns the 1d array of the error estimate corresponding to the data response
  
          :return: 1d numpy array of response, 2d array of additonal errors (e.g. point source uncertainties)