National Institute Of Open Schooling — error msg while submitting online form

Address:

Imphal East, Manipur, 795116

While filling up the diploma in elementary education course form online in teacher registration after filling up as per process i submit but error msg shows on the screen, i am adding the snapshot below, plis do the needful. I have tried couple of times but in vain, my fren also having the same problem, and payment confirmation online is also slow in processing.