You didn't say what was wrong. I notice that
position is spelled wrong in
get_mouse_position(). Also, are you using Godot 3.0? If so, then this code won't work because there is no longer a
set_pos() function, but instead you use the
position property of the object.
If neither of these are the problem, please comment with more information (especially if you have an error message).
Note: I edited your post to fix the code formatting. Please use the code formatting button when posting code so that it is readable.