How come I can't move in the built version of my game?

I decided to try out a build of the game (an FPS) on my PC, and to see what the requirements for the game would be so far. (by using VMWare player)

However, I came across a problem... I can't move.

The player starts off above the ground, I did this to test the gravity, and I stay in the air!

The mouse and the shooting, but I can't move and the gravity is non existent.

I'm also getting this error in the log on the bottom-left: "Gamename/Gamename_Data/mainData is corrupted! Remove it and launch unity again! [Position out of bounds! 34308 > 34304]".

How do I fix this problem?

Also, how can I get rid of the mouse pointer in the game build?

EDIT: The problem seems to be the FPS Input Controller script I have, because all the thing I couldn't do in the build is handled by this script, here's the code (It's in C#): using UnityEngine; using System.Collections;

 public class FPSInputController : MonoBehaviour {
 
     public float speed = 100;
     public float jumpSpeed = 0;
     public Vector3 moveDirection = Vector3.zero;
     public float gravity = 200;
     public bool grounded = false;
     
     // Use this for initialization
     void Start () {
     
     }
     
     // Update is called once per frame
     void Update () 
     {
         if (grounded)
         {
             moveDirection = new Vector3(Input.GetAxis("Horizontal"), 0, Input.GetAxis("Vertical"));
             moveDirection = transform.TransformDirection(moveDirection);
             moveDirection*= speed;
         }
         if (grounded)
         {
             if(Input.GetButtonDown("Jump"))
             {
                 moveDirection.y = jumpSpeed;
             }
         }
         moveDirection.y -= gravity * Time.deltaTime;
         var controller = GetComponent<CharacterController>();
         var flags = controller.Move(moveDirection * Time.deltaTime);
         grounded = (flags & CollisionFlags.CollidedBelow) !=0;
     }
 }