How to implement character movement functionality for Buttons in

On Keybroad A and D for character turn left and right. But on mobile touch screen, added 3 Buttons - left arrow Button ( move character left 45 degree, right arrow Button (move character right 45 degree) up arrow is for character to JUMP(this works fine) Please anyone Help me with left and right button character movement functionality.

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I'm trying to do grid based movement but I keep getting this error when I press a button to mave my character. I cant figure this out. : r/godot