Can't use GetComponent (Calling JS in C#), and don't know why

Hello everyone,

I'm having troubles to run an autowalk function with my VR project. Here's the deal : I'd like to make a VR camera with an autowalk function (like in the Tuscany demo) : to walk, you just have to look your feet and an icon will turn from red to green, activating the autowalk.

I used the Google cardboard SDK for the camera asset, and the Durovis Dive SDK for the autowalk function.

But to toogle the autowalk int value, I have to call in my C# forward.cs an int function autowalk from a JS script.

The script execution order is set to launch the JS first, but it doesn't work (because i'm pretty bad, I'm a videomaker, not a developer :D

Here's my forward.cs :

 using UnityEngine;
 using System.Collections;
 
 [RequireComponent(typeof(Collider))]
 public class avance : MonoBehaviour {
 public float speed=1f;
 private CardboardHead head;
 
   void Start() {
     head = Camera.main.GetComponent<StereoController>().Head;
     }
 
   void Update() {
     RaycastHit hit;
     bool isLookedAt = GetComponent<Collider>().Raycast(head.Gaze, out hit, Mathf.Infinity);
     GetComponent<Renderer>().material.color = isLookedAt ? Color.green : Color.red;
     if (Cardboard.SDK.CardboardTriggered && isLookedAt) {
       // Action à déclencher
 
     GetComponent<DiveFPSController>.toggle_autowalk();
             }
         }
 }
 

et the JS autowalk public function, from DiveFPSController.js

 function toggle_autowalk(){
     if (autowalk==0)autowalk=1;
     else autowalk=0;
 }
 

I searched so many hours on forums to call a JS function properly, but I don't understand what's missing. Thanks in advance !