Tnvelaivaaippu.gov.in — Couldn't able to add caste while adding degree

HI Sir/Madam,
My name is BRUNDHA B
USER ID : ERD2015F00017440
When i was trying to add my degree qualification, it shows validate as "Please enter the CASTE". But, that field is disabled. So, I couldn't able to add my qualification details. I kindly request you to look at this from your end and add my caste details. Community : BC
Caste: KAI KOLAR
Thanking you sir/madam.