Movement script with a draining stamina bar

Hello everyone, I have just started out with coding in Java with some help from friends, this forums and other guides. I'm currently making the movement script wich will add a stamina bar to the screen and deplete it as I run (holding shift). It will also make the character unable to run again until currentStamina = maxStamina.... However I rain into a problem with the Collisionflags code with this error:

 BCE0051: Operator '&' cannot be used with a left hand side of type 'System.Type' and a right hand side of type 'boolean'.

wich is this line of code:

 if(( CollisionFlags & CollisionFlags.CollidedBelow != 0) && !jumping)
 
         {
             y = gravity * Time.deltaTime;
         }

If it helps, here's the whole code:

     var moveDirection : Vector3 = Vector3.zero;
 
     var walkSpeed = 5.0;
     var runSpeed = 2.0;
     var jumpSpeed = 8.0;
     var gravity = 20.0;
     var tiredSpeed = 0.25;
     var curSpeed = 0.00;
     
     var jumping : boolean;
     var mayRun : boolean;
     
     // Stamina bar size
 var StaminaBarWidth = 0.00;
 var StaminaBarHeight = 0.00;
 
 
 
 var StaminaPlacementY = 0.00;
 
 
 // Stamina bar function
 var currentStamina =  100.00;
 var maxStamina = 100.00;
 var curAdjusted = 0;
 var allowStaminaReg : boolean = true;
 var isRunning : boolean = false;
 
 
     
 var _cc = CharacterController;
 var  _flags = CollisionFlags;
     
     
     
     function  Start()
     {
     StaminaBarWidth = Screen.width / 7.30;
     StaminaBarHeight = Screen.height / 30.00;
     
     StaminaPlacementY = (20.00);
     
     
     }
     function Update() 
 {
         var x = Input.GetAxis("Horizontal") * curSpeed * Time.deltaTime;
         var y = -0.75*Time.deltaTime;
         var z = Input.GetAxis("Vertical") * curSpeed * Time.deltaTime;    
         
         
 
     if(Input.GetKey(KeyCode.LeftShift)&& mayRun)
     {
         isRunning = true;    
         SetRunSpeed();
         if(curAdjusted != 10.00)    
         {
             curAdjusted = 10.00;
         }    
         
         if(currentStamina <4)
         {
         mayRun = false;
         }
     }
         
     else 
     {
         SetWalkSpeed();
         if(curAdjusted != 3.50)
         {
             curAdjusted = 3.50;
         }
         isRunning = false;
         
     }
     
     AdjustCurrentStamina(curAdjusted);
 
 
         
 
 
 
         
         if(( CollisionFlags & CollisionFlags.CollidedBelow != 0) && !jumping)
 
         {
             y = gravity * Time.deltaTime;
         }
         
                 
         moveDirection = new Vector3(x, y, z);
         
         _flags = _cc.Move(moveDirection);
         
 }
         
         
     function SetWalkSpeed ()
     {
         if(curSpeed != walkSpeed)
         {
             curSpeed = walkSpeed;
         }
     }
     
     function SetRunSpeed()
     {
         if(curSpeed !=runSpeed)
         {
             curSpeed = runSpeed;
         }
     }
 
     
             
     function OnGui()
     {
     GUI.Box (new Rect(5.00, StaminaPlacementY, StaminaBarWidth, StaminaBarHeight), " Stamina");
     }
     
     function AdjustCurrentStamina(adjst : float)
 {
     if (isRunning)
     {
         currentStamina -= adjst *Time.deltaTime;
     }
     else
     {
         currentStamina += adjst*Time.deltaTime;
     }
         
     if(currentStamina < 4.00)
         currentStamina = 4.00;
     if(currentStamina > maxStamina)
         mayRun = true;
         currentStamina = maxStamina;
     if(maxStamina < 1.00)
         maxStamina = 1.00;
         
     StaminaBarWidth = (Screen.width / 7.30 ) * (currentStamina / maxStamina);
 
 }

I already now want to say THANK YOU if you take your time with my problem, means alot!