getting session expired errors

I have been using the same code for the last one year. i have active subcription and 2fa enabled. This was working till yesterday.
When I try to create a user session, I get this error today
session expired
at com.zerodhatech.kiteconnect.kitehttp.KiteResponseHandler.dealWithException(
at com.zerodhatech.kiteconnect.kitehttp.KiteResponseHandler.handle(
at com.zerodhatech.kiteconnect.kitehttp.KiteRequestHandler.postRequest(
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