Help me please about [invalid Volume] fail :(

Emre Bahtli  

failed CTrade::OrderSend: instant buy 0.01 EURUSD at sl: ..... [invalid volume

Hello masters. I am new among you. When I try to put stop loss on my little robot, after a while I get this error. Can someone arrange this for me as it should be?

so that I can learn something new. I apologize in advance for taking your time for me. And I thank you in advance for your help.