How to make a 3D Platfomer in Godot 4: Setup, Movement, and Camera Controls - code dump

Player.gd

extends RigidBody3D

var mouse_sensitivity := 0.001
var twist_input := 0.0
var pitch_input := 0.0

@onready var twist_pivot := $TwistPivot
@onready var pitch_pivot := $TwistPivot/PitchPivot

func _ready() -> void:
	Input.set_mouse_mode(Input.MOUSE_MODE_CAPTURED)
	
# Called every frame. 'delta' is the elapsed time since the previous frame.
func _process(delta: float) -> void:
	var input := Vector3.ZERO
	input.x = Input.get_axis("move_left", "move_right")
	input.z = Input.get_axis("move_forward", "move_back")
	
	apply_central_force(twist_pivot.basis * input * 1200.0 * delta)
	
	var aligned_force = twist_pivot.basis * input
	
	if Input.is_action_just_pressed("ui_cancel"):
		Input.set_mouse_mode(Input.MOUSE_MODE_VISIBLE)
		
	twist_pivot.rotate_y(twist_input)
	pitch_pivot.rotate_x(pitch_input)
	pitch_pivot.rotation.x = clamp(pitch_pivot.rotation.x, 
		deg_to_rad(-30), 
		deg_to_rad(30)
	)
	twist_input = 0.0
	pitch_input = 0.0


func _unhandled_input(event: InputEvent) -> void:
	if event is InputEventMouseMotion:
		if Input.get_mouse_mode() == Input.MOUSE_MODE_CAPTURED:
			twist_input = - event.relative.x * mouse_sensitivity
			pitch_input = - event.relative.y * mouse_sensitivity

Bro using this code in godot 4 the player just fips down starts to roll how can i fix it

Bro using this code in godot 4 the player just fips down starts to roll how can i fix it

Turn on Deactivation -> Lock Rotation in the properties for the base player object

whatever I do, ANYTHING I do I keep getting errors in lines 39 and 40!!! >⌓<

Script inherits from native type 'RigidBody3D', so it can't be assigned to an object of type: 'MeshInstance3D'