How can slove input value unique validation on multiple columns for Laravel-5.4

I want to input value validate Unique With multiple columns value in Laravel 5.4

//set Validation Rule

$validator = Validator::make($request->all(), [            
    'dock_name' => 'required|unique_with:docks,zone_id'
]);

Show Error as:

Method [validateUniqueWith] does not exist

[DB_Table:docks Index: ALTER TABLE rdb.docks ADD UNIQUE dock_zonid (dock_name, zone_id)]

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