Help me with HDFC error

try netbanking

First, you need to add a new Biller (in this case the credit card you want to pay a bill)
Then wait for 2-3 days to get that biller activated.
Once you see it as "Active", you will be able to pay a bill.

how much amount being paid? biller active?

I guess you got the new HDFC Account, Wait for 24H after adding the billers, it will start working the next day.

I also faced the same this month after opening the new account.