How to place both Buy/Sell and SL(of respective Buy/Sell) orders at once in Zerodha?

Hi,

I tried the GTT today for testing purposes. Please find the attached screenshot for the details/error.

Summary of my trade: I bought the 26000 CE 16th Dec Nifty option at market price (it was around 113) and set a stop-loss at 107 and a target at 120. However, I was getting an error. Could you please check and let me know why this happened and how to mitigate it?