app/code/local/Mygento/Yandexdelivery/Model/Source/Yd.php
The class Mygento_Yandexdelivery_Model_Source_Yd is not named in CamelCase. Open
Open
class Mygento_Yandexdelivery_Model_Source_Yd
{
public function toOptionArray()
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CamelCaseClassName
Since: 0.2
It is considered best practice to use the CamelCase notation to name classes.
Example
class class_name {
}