V3.0 Custom validation messages

My AtriclesTable has 

public function validationDefault($validator) {

        $validator

            ->add('title', 'not-Empty', [

                'rule' => 'notEmpty',

                'message' => 'You need to provide a title',

            ])

            ->add('body', 'not-Empty', [

                'rule' => 'notEmpty',

                'message' => 'A body is required'

            ]);

        return $validator;

}

When I try to save an article entity the validation runs fine but I am only getting the default in the ArticleEntity 

'errors' => [

'title' => [

(int) 0 => 'This field cannot be left empty'

],

'body' => [

(int) 0 => 'This field cannot be left empty'

]

]

Additionally there is a warning 

Strict (2048): Declaration of App\Model\Table\ArticlesTable::validationDefault() should be compatible with Cake\ORM\Table::validationDefault(Cake\Validation\Validator $validator) [APP/Model/Table/ArticlesTable.php, line 7]

What additional steps are needed to fix this?

Cheers

Tarique

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