How do I switch the components from a character motor to a character controller?

I am trying to code some underwater functionality for my Unity game, but I am having trouble switching the CharacterMotor components to the CharacterController ones. This is my code:

 #pragma strict
 
 var waterLevel : float;
 var myParticles : ParticleSystem;
 private var isUnderwater : boolean;
 private var normalColor : Color;
 private var underwaterColor : Color;
 private var charcontroller:CharacterController;
 
 function Start () 
     {
         normalColor = new Color (0.5f, 0.5f, 0.5f, 0.5f);
         underwaterColor = new Color (0.22f, 0.65f, 0.77f, 0.5f);
         charcontroller = GetComponent(CharacterController);
         myParticles.Stop();
         GameObject.Find("Blob Light Projector").GetComponent(Projector).enabled = false;
     }
 
 function Update () 
     {
             if ((transform.position.y < waterLevel) != isUnderwater) 
             {
                 isUnderwater = transform.position.y < waterLevel;
                 if (isUnderwater) SetUnderwater ();
                 if (!isUnderwater) SetNormal ();
             }
 
             if(isUnderwater && Input.GetKey(KeyCode.E))
             {
                 constantForce.relativeForce = Vector3(0,-200, 0);
             }
             else
             {
                 constantForce.relativeForce = Vector3(0, 0, 0);
             }
 
             if(isUnderwater && Input.GetKey(KeyCode.Q))
             {
                 constantForce.relativeForce = Vector3(0, 200, 0);
             }
      }
 
 function SetNormal () 
         {
             RenderSettings.fogColor = normalColor;
             RenderSettings.fogDensity = 0.05f;
             GameObject.Find("Blob Light Projector").GetComponent(Projector).enabled = false;
         }
 
 **function SetUnderwater () 
         {
             RenderSettings.fogColor = underwaterColor;
             RenderSettings.fogDensity = 0.08f;
             charcontroller.Move.gravity = 2;
             charcontroller.Move.maxFallSpeed = 5;
             charcontroller.Move.maxForwardSpeed = 4;
             charcontroller.Move.maxSidewaysSpeed = 4;
             myParticles.Play();
             GameObject.Find("Blob Light Projector").GetComponent(Projector).enabled = true;
         }**

The bolded code is where the error is coming from. Here is a snapshot of the errors I'm getting: enter image description here

Any help would be really appreciated! Thanks!