Toxe Artem2P Your _ready function is invalid. It needs at least one statement. Try this: func _ready() -> void: pass Or delete it.
xyz Artem2P Looks like node named PathFollow3D doesn't exist in the scene you're trying to access it from.
Toxe Artem2P Does %PathFollow3D exist? The error message would imply that it is null. Does a print(%PathFollow3D) in your _physics_process print null?
xyz Artem2P You're trying to access the node via unique name syntax but you haven't set the node to be scene unique. Right click on the node in the Scene tree and select Access as Unique Name from popup. The % icon should next to it.
