Error in acf-field_selector-v5.php

[bandarboladunia]

Notice: Undefined property: acf_field_field_selector::$settings in D:\xampp\htdocs\ftw-trial\wp-content\plugins\acf-field-selector-field\acf-field_selector-v5.php on line 194

Notice: Undefined property: acf_field_field_selector::$settings in D:\xampp\htdocs\ftw-trial\wp-content\plugins\acf-field-selector-field\acf-field_selector-v5.php on line 195

for now, I just put :

var $settings, $defaults;

below :

class acf_field_field_selector extends acf_field {

like acf-field_selector-v4.php and it's work and the error is already done.