Why am i getting this error?

UnassignedReferenceException: The variable SpawnPointone of 'SpawnManager' has not been assigned. You probably need to assign the SpawnPointone variable of the SpawnManager script in the inspector. SpawnManager.OnGUI () (at Assets/Standard Assets/Scripts/SpawnManager.js:40)

It says its not assigned but it is here's a screenshot http://gyazo.com/143947785a411bd52005fc1ef0fa7b5a.png

Here's my SpawnManager Script

 #pragma strict
 
 var Connection : boolean = false;
 
 var Playerone : GameObject;
 var Playertwo : GameObject;
 
 var SpawnPoint : String = "";
 var Dead : boolean = true;
 
 var SpawnPointone : GameObject;
 var SpawnPointtwo : GameObject;
 
 var CenterW : float;
 var CenterH : float;
 
 function Start () {
     SpawnPoint = "";
     CenterW = Screen.width / 2 - 150;
     CenterH = Screen.height / 2 - 80;
 }
 
 function OnGUI()
 {
     if(Network.peerType == NetworkPeerType.Disconnected)
     {
         Connection = false;
     }
     else
     {
         Connection = true;
     }
     if(Connection == true)
     {
         if(SpawnPoint == "")
         {
             GUI.Box(Rect(CenterW, CenterH, 300, 160), "Select a Spawnpoint");
             if(GUI.Button(Rect(CenterW + 5, CenterH + 20, 290, 65), "Spawn 1"))
             {
                 Network.Instantiate(Playerone, SpawnPointone.transform.position, transform.rotation, 0);
                 SpawnPoint = "one";
                 Dead = false;
             }
             if(GUI.Button(Rect(CenterW + 5, CenterH + 90, 290, 65), "Spawn 2"))
             {
                 Network.Instantiate(Playertwo, SpawnPointtwo.transform.position, transform.rotation, 0);
                 SpawnPoint = "two";
                 Dead = false;
             }
         }
         else
         {
             if(Dead == true)
             {
                 if(GUI.Button(Rect(CenterW + 5, CenterH + 20, 290, 130), "Respawn"))
                 {
                     if(SpawnPoint == "one")
                     {
                         Network.Instantiate(Playerone, SpawnPointone.transform.position, transform.rotation, 0);
                         Dead = false;
                     }
                     if(SpawnPoint == "two")
                     {
                         Network.Instantiate(Playertwo, SpawnPointtwo.transform.position, transform.rotation, 0);
                         Dead = false;
                     }
                 }
             }
         }
     }
 }