The reason was expired subscription which is interesting. Renewal was done together for app and historical, but historical expired one day before. I don't know why? In the subscription expiring mails it was saying there is automatic renewal. **As you have linked your Zerodha account (xxxx) to your developer console, we will try to deduct money and renew your app automatically. Please make sure your Zerodha account has enough money. There is sufficient funds but it failed to renew subscription automatically. The exception problem is solved by renewing and relogin.
I think you created a session and then subscribed for historical data API.
In the subscription expiring mails it was saying there is automatic renewal.
**As you have linked your Zerodha account (xxxx) to your developer console, we will try to deduct money and renew your app automatically. Please make sure your Zerodha account has enough money.
There is sufficient funds but it failed to renew subscription automatically. The exception problem is solved by renewing and relogin.