A 14-year-old girl complains of pain in vaginal area and lower abdomen that last for 3-4 days and have been observed for 3 months about the same time. Each time pain is getting worse. Objectively: mammary glands are developed, hairiness corresponds to the age. The virginal membrane is intact, cyanotic and protruded. She has never had menstruation. She has been diagnosed with primary amenorrhea. What is the reason of amenorrhea?