Please do a bit of research when you run into problems like this. You should try searching up what the error means, how to use the functions you’re calling or examples of the thing you’re trying to accomplish. If you go to the LoadAnimation API reference page, it shows that you need to call this with an Animation object rather than a string.
When you use LoadAnimation, the Animator object is automatically created by the server and the player is given ownership of it. Because this Animator object exists, you don’t need remotes for animations. When a client plays an animation, the playback is replicated automatically.