and also some time FX gives me this error

Hi everyone, I would like to set the Stop Loss of my operation in the following way: (Price when I opened the order) minus (ATR value at the time of opening the order x 2). Made this calculation and found the value, I would like it to be set as a stop loss in my buy now button, but something is not working, can anyone explain what and give me a hand ?? this is the link https://fxdreema.com/shared/jthcJNmpc