How can I make my plane takeoff in SITL?

when I input the order:commander takeoff,my plane have no reaction.
I start the simulation with GAZEBO-CLASSIC

What’s the output in the console, and in QGC?

Hi,I just use PX4 and ROS2 for simulation.And I want to control my plane in gazebo by offboard control.The out put in terminal is this:[tone_alarm] notify negative