E 0:00:00:0921 step: <Tween#-9223371996673342262>: started with no Tweeners.
<C++ Error> Method/function failed. Returning: false
<C++ Source> scene/animation/tween.cpp:301 @ step()

    420mangojuice Tweens are no longer nodes, look for my other replay to some older post, I have added an example on how to use them in 4.0.
    I guess that's why the engine return this error, it's kind of a reminder and devs may not have roughly remove entry point in the API, for now.

      Here's a video tutorial as well that explains further.

      I do believe the new Godot 4 way is better generally, there's really only a few lines of code you have to worry about now and I remember it was a tad ridiculous when I looked at setting up tweens in 3.5