Strange Error with Itween PutOnPath

Dont hate, this is my first game. i only have high-school any advice is greatly appreciated CODE FIRST (without Error):

 private Vector3 stuff;
     private Vector3[] pathR;
     private Vector3[] pathM;
     private Vector3[] pathL;
     private Vector3[] pathUR;
     private Vector3[] pathUM;
     private Vector3[] pathUL;
     private Vector3[] pathDR;
     private Vector3[] pathDM;
     private Vector3[] pathDL;
     private Vector3[] currPath;
     public string strPath;
     private float countTime= 0;
     private float percent;
     private bool move = false;
     private bool possible = false;
     private float timeFixed; 
     private float futurePercent; 
     private float futureRotate; 
     private float tempoTotal = 10f;
     private float tempoTroca = 1f;
     private float lookTime = 2f;
     // Use this for initialization
     void Start () {
         //etc...
         player = GetComponent<Transform> ();
         alien = GetComponent<CharacterController> (); 
         cameraTransform = GameObject.FindGameObjectWithTag("MainCamera").transform;
 
         //Adicionar propriedades aos caminhos
         iTween.Hash("path", iTweenPath.GetPath("MidPath"), "time",tempoTotal ,"orienttopath", true, "easetype", iTween.EaseType.linear );    
         iTween.Hash("path", iTweenPath.GetPath("LeftPath"), "time",tempoTotal ,"orienttopath", true, "easetype", iTween.EaseType.linear);    
         iTween.Hash("path", iTweenPath.GetPath("RightPath"), "time",tempoTotal ,"orienttopath", true,  "easetype", iTween.EaseType.linear);
         iTween.Hash("path", iTweenPath.GetPath("UpMidPath"), "time",tempoTotal ,"orienttopath", true,  "easetype", iTween.EaseType.linear);    
         iTween.Hash("path", iTweenPath.GetPath("UpLeftPath"), "time",tempoTotal ,"orienttopath", true,  "easetype", iTween.EaseType.linear);    
         iTween.Hash("path", iTweenPath.GetPath("UpRightPath"), "time",tempoTotal ,"orienttopath", true,  "easetype", iTween.EaseType.linear);
         iTween.Hash("path", iTweenPath.GetPath("DownMidPath"), "time",tempoTotal ,"orienttopath", true,  "easetype", iTween.EaseType.linear);    
         iTween.Hash("path", iTweenPath.GetPath("DownLeftPath"), "time",tempoTotal ,"orienttopath", true,  "easetype", iTween.EaseType.linear);    
         iTween.Hash("path", iTweenPath.GetPath("DownRightPath"), "time",tempoTotal ,"orienttopath", true,  "easetype", iTween.EaseType.linear);
         //Caminhos em array
         pathM = iTweenPath.GetPath ("MidPath");
         pathL = iTweenPath.GetPath ("LeftPath");
         pathR = iTweenPath.GetPath ("RightPath");
         pathUM = iTweenPath.GetPath ("UpMidPath");
         pathUL = iTweenPath.GetPath ("UpLeftPath");
         pathUR = iTweenPath.GetPath ("UpRightPath");
         pathDM = iTweenPath.GetPath ("DownMidPath");
         pathDL = iTweenPath.GetPath ("DownLeftPath");
         pathDR = iTweenPath.GetPath ("DownRightPath");
         strPath = "mid";
         currPath = pathM;
 
     }
 
 (...)
 void LateUpdate(){
         countTime += Time.deltaTime; 
         percent = (countTime / tempoTotal)-0.001f; 
         futurePercent =((tempoTroca+countTime) / tempoTotal)-0.001f; 
         futureRotate =(countTime / tempoTotal)+0.201f;
         possible=false;
         if (Input.GetKeyDown(KeyCode.LeftArrow)) {
             if (strPath == "right") {
                 possible = true;
                 currPath = pathM;
                 strPath = "mid";
                 stuff = iTween.PointOnPath(iTweenPath.GetPath("MidPath"), futurePercent);
             } 
 (...)
         if (move == false || countTime > timeFixed) {
             move = false;
             iTween.LookUpdate (gameObject, iTween.Hash("looktarget", stuff, "time", lookTime));
 
             if (countTime <= tempoTotal)
             Error here--->iTween.PutOnPath (gameObject, currPath, percent);<----Error here
             stuff = iTween.PointOnPath(currPath, futureRotate);
 
         }

The following Error appears when i change "tempoTotal" value to 20 or above. i change nothing in the code only the "tempoTotal" value. anyone knows what error is this?

PS: the game still runs without error and does everything so far

IndexOutOfRangeException: Array index is out of range. iTween.Interp (UnityEngine.Vector3[] pts, Single t) (at Assets/Plugins/Pixelplacement/iTween/iTween.cs:6708) iTween.PutOnPath (UnityEngine.GameObject target, UnityEngine.Vector3[] path, Single percent) (at Assets/Plugins/Pixelplacement/iTween/iTween.cs:5495) PlayerMotor.LateUpdate () (at Assets/scripts/PlayerMotor.cs:355)