private function _errorConfig() {
        //error code config
        $error1 = (object) [
            'code' => 1,
            'resourceId' => false,
            'description' => 'Resource Not Found'
        ];

        $error2 = (object) [
            'code' => 2,
            'resourceId' => false,
            'description' => 'Circular Dependency Detected'
        ];

        $this->_errorCodes = [
            1 => $error1,
            2 => $error2
        ];
    }