Is_on_floor() is not working

[RCS_Blender_Art]

Godot Version

4.2.2

Question

I’m making a 2d side-scrolling game and I’m currently making CharacterStateMachine but in my AirState I get this error “Cannot call non-static function “is_on_floor()” on the class “CharacterBody2D” directly. Make an instance instead.”
this is my AirState script

this is my CharacterStateMachine script

please help me
(My english is not that good,Sorry)

[gertkeno]

Make sure your character is assigned in the inspector, looks like it might have previously been saved as

= CharacterBody2D instead of using the colon to declare a type : CharacterBody2D.

[RCS_Blender_Art]

Thank for the help.
Sorry I didn’t reply for so long,I have to stop my project for a while but now I’m back to work on it.