can't flip the AnimatedSprite

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the node is the child of the player, but still I get this error:

Invalid set index 'flip_h' (on base: 'null instance') with value of type 'bool'.

Here is my code:

if Input.is_action_pressed("ui_right"):
    $HitEffect.flip_h = false

if Input.is_action_pressed("ui_left"):
    $HitEffect.flip_h = true

Big thanks for the help