anchor.diff:      nif_scheduler:declineOffer(OfferId).
   
   -spec declineOffer( OfferId :: #'OfferID'{},
  -                    Filter :: #'Filters'{}) 
  -                    ->{ok, driver_running }
  +                    Filter :: #'Filters'{}) ->
  +                      {ok, driver_running }
                       | {error, scheduler_not_inited} 
                       | {error, {invalid_or_corrupted_parameter, offer_id}}
                       | {error, {invalid_or_corrupted_parameter, filters}}
  
positive.code: 
  %% -----------------------------------------------------------------------------------------
  
  -spec declineOffer( OfferId :: #'OfferID'{}) 
                      -> {ok, driver_running } 
                      | {error, scheduler_not_inited} 
                      | {error, {invalid_or_corrupted_parameter, offer_id}}
                      | {error, driver_state()}.
  
negative.code: 
  -spec sendFrameworkMessage( ExecutorId :: #'ExecutorID'{},
                              SlaveId :: #'SlaveID'{},
                              Data ::string()) -> 
                                {ok, driver_running }
                              | {error, scheduler_not_inited} 
                              | {error, {invalid_or_corrupted_parameter, executor_id}}
                              | {error, {invalid_or_corrupted_parameter, slave_id}}
  