Animating the sprites issue

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https://www.youtube.com/watch?v=G44YMwBoJXM&list=PLZm85UZQLd2TPXpUJfDEdWTSgszionbJy&index=13

In the tutorial it shows frames.add for example, but my libgdx doesn't show frames as being valid. It was the same for cam.update or whatever else earlier in the tutorial because the code changed to camera instead of "cam".

Does anyone know the new info on this? Any help is appreciated, thanks.