ESIC Payment - In Modify option when I check its showing no Challan generated

Dear Seniors, I have prepared ESIC in challan of Mar & April in May month and now i am trying to pay the amount online but it is not processing. showing cant process this transaction. Kindly advise how can i modify the challan.
In Modify option when I check its showing no Challan generated for this but in Online double verification its showing.
Pls advise how to make the payment. is there any period that after that we cant process payment.

Try On home page of esic.in,
Find pay e-challan option under esic links.
Payment gate way will open if challan is created.

E-Pay challan is showing but when i process Online payment its showing that we cant process this transactions.
Actually this payment is for the m/o Mar'20 and Apr'20.
Is there any rule that we cant process after 42days(as per attachment).
Kindly advise now how can i process Online payments of above months.