How to solve the problem:'isaacgym._bindings.linux-x86_64.gym_38.Gym' object has no attribute 'create_force_sensor'?

Hi, I’m using isaac gym, and its version is IsaacGym_Preview_4_Package.When I try to use ‘create_force_sensor’,the terminal will prompt:
sensor = self.gym.create_force_sensor(env_ptr, sensor_handle, sensor_pose)
AttributeError: ‘isaacgym._bindings.linux-x86_64.gym_38.Gym’ object has no attribute ‘create_force_sensor’
Thanks!