Human UI Update 3d view problem


Im trying to update my 3d view on human ui and i studied the example file.
But i cannot seem to solve the error that i get with it.
Can you help me solve it and create an interactive 3d view with the slider?
I am trying this for my final presentation, would be great if you can help me !!
TASK5_FINAL (2).gh (103.1 KB)