TOTP is mandatory to place orders error

I am Using Tech.Zerodha.KiteConnect c# .Net Client for communicating with Kit connect API. while Placeing order using kite.PlaceOrder(....) following error occurs "TOTP is mandatory to place orders on third-party apps. Learn how to set up TOTP for your account [here](https://support.zerodha.com/category/your-zerodha-account/login-credentials/login-credentials-of-trading-platforms/articles/time-based-otp-setup-mobile-only). "

as per this Link I acctived TOTP in my zerodha account but still this Error occurs.


Please guide me through solution for solving the aforesaid error.