Need Help!

I have created a script to allow my FPS Character to pick up objects and through them (like in Amnesia). I can pick up an object and throw it but once I do my Character can no longer pick up objects and i get a NullReferenceException. Also the object is locked on the y axis for some reason.

 var baseForce : float = 5; //Base Force Applied to Object
 
 var catchRange : float = 4; //Max Range of Object Interaction
 
 var heldRange : float = 3; //Distance of Object Away from FPS Controller
 
 enum ObjectState { Free, Held, Thrown }; // Free - Can Pick Up, Held - Can Not Pick Up, Thrown - Apply Force to Object
 
 private var objectState : ObjectState = 0; //Set objectStae to Free
 
 private var rigid : Rigidbody = null; //Set var Rigid as unknown
 
 function FixedUpdate() {
 
     if ( objectState == ObjectState.Free ) { //If Free
 
         if (Input.GetButton( "Fire1" )) { //If Fire1 Clicked
 
         var hit :RaycastHit;
 
             if ( Physics.Raycast(transform.position, transform.forward, hit, catchRange )) { //Send Ray Foward by catchRange 
  
                 if ( hit.rigidbody ) { //If it Hits Rigidbody
   
                 rigid = hit.rigidbody;
                 
                 objectState = ObjectState.Held; //Set objectState to Held
    
 }
 }
 }
     else { 
     
     rigid.useGravity = true;
     
     
 
 }
 }
 
     else if ( objectState == ObjectState.Held ) {
 
     rigid.MovePosition(transform.position + transform.forward * heldRange); //Moves Rigidbody Forward
 
     rigid.useGravity = false; // Disables Gravity
 
         if (Input.GetButton( "Fire2" )) {
 
         rigid.useGravity = true;
         
         objectState = ObjectState.Thrown;
         
 
 }
 }
 
     else if ( objectState == ObjectState.Thrown ) {
     
     rigid.AddForce (transform.forward * baseForce );
 
     objectState = ObjectState.Free;
 
 }
 
     if (!Input.GetButton( "Fire1" )) {
     
     objectState = ObjectState.Free;
 
 }
 }