I get an error message every time i run this script? Any ideas?

This is the error message and it's causing me no not be able to build the game itself. Failed to Instantiate prefab: Sean. Client should be in a room. Current connectionStateDetailed: Authenticating UnityEngine.Debug:LogError(Object) PhotonNetwork:Instantiate(String, Vector3, Quaternion, Byte, Object[]) (at Assets/Photon Unity Networking/Plugins/PhotonNetwork/PhotonNetwork.cs:2449) PhotonNetwork:Instantiate(String, Vector3, Quaternion, Byte) (at Assets/Photon Unity Networking/Plugins/PhotonNetwork/PhotonNetwork.cs:2432) NetWorkmanager:SpawnMyPlayer(Int32) (at Assets/Scripts/NetWorkmanager.cs:165) NetWorkmanager:OnGUI() (at Assets/Scripts/NetWorkmanager.cs:131)

Here's the code:`

public class NetWorkmanager : MonoBehaviour { public static bool connecting = false; List chatMessages; int maxChatMessages = 5; public static GameObject Standby; public string stringToEdit = string.Empty; public static GameObject StandbyCam; bool hasPickedTeam = false; int teamID = 0; // Use this for initialization void Start () {

     Standby = GameObject.Find ("Main");
     StandbyCam = GameObject.Find ("~WaitingCamera");
     PhotonNetwork.player.NickName = PlayerPrefs.GetString ("Username", "Type Here");;
     chatMessages = new List<string>();
     Standby.SetActive (true);
     StandbyCam.SetActive (true);
     InvokeRepeating ("Update", 0f, 1.0f);

 }

 void OnDestroy (){
     PlayerPrefs.SetString ("Username", PhotonNetwork.player.NickName);
 }

 public void AddChatMessage(string m)
 {
     GetComponent<PhotonView> ().RPC ("AddChatMessage_RPC", PhotonTargets.AllBuffered, m);
 }

 [PunRPC]
  void AddChatMessage_RPC(string m)
 {
     chatMessages.Add (m);
     while (chatMessages.Count >= maxChatMessages)
     {
         chatMessages.RemoveAt (0);
     }

 }

 public void AddlocalMessage(string m)
 {
     chatMessages.Add (m);
     while (chatMessages.Count >= maxChatMessages)
     {
         chatMessages.RemoveAt (0);
     }
 }


 void Update(){

 }


 void Connect (){
     PhotonNetwork.ConnectUsingSettings ("1.0.0");

 }
 public void OnGUI()
 {
     if (GUILayout.Button ("Plans"))
     {
         AddlocalMessage ("Current Plan: " + currentQuest);
     }
     if (PhotonNetwork.connected == true && connecting == false) {
         
     GUILayout.BeginHorizontal (GUILayout.MaxWidth(250));

         stringToEdit = GUI.TextField (new Rect(0, 889, 200, 20), stringToEdit, 50);
 
         if (GUI.Button(new Rect(201, 889, 75, 20), "Send"))
             {
                 
                 if (!string.IsNullOrEmpty (stringToEdit.Trim ())) {
                     AddChatMessage (PhotonNetwork.player.NickName + ": " + stringToEdit);
                     stringToEdit = string.Empty;
                 }
             }
             GUILayout.EndHorizontal ();
     }

         
     


     if (PhotonNetwork.connected == false && connecting == false) {
         //GUILayout.BeginArea(new Rect(0, 0, Screen.width, Screen.height));
         //GUILayout.BeginHorizontal();
         //GUILayout.FlexibleSpace();
         //GUILayout.BeginVertical(); 
         //GUILayout.FlexibleSpace ();

         //GUILayout.BeginHorizontal();
         //GUILayout.Label ("Username: ");
         //PhotonNetwork.player.NickName = GUILayout.TextField (PhotonNetwork.player.NickName);
         //GUILayout.EndHorizontal();


         //GUILayout.FlexibleSpace();
         //GUILayout.EndVertical(); 
         //GUILayout.FlexibleSpace();
         //GUILayout.EndHorizontal ();
         //GUILayout.EndArea ();
     }
     if (PhotonNetwork.connected == true && connecting == false) {
         if (hasPickedTeam) {
             GUILayout.BeginArea (new Rect (0, 0, Screen.width, Screen.height));
             GUILayout.BeginVertical (); 
             GUILayout.FlexibleSpace ();

             foreach (string msg in chatMessages) {
             
                 GUILayout.Label (msg);

             }
             GUILayout.EndVertical (); 
             GUILayout.EndArea ();
         }

         else {
             SpawnMyPlayer (Random.Range (1, 2));

         }
     }


 }
 void OnJoinedLobby(){
     Debug.Log ("Joinedlobby");
     PhotonNetwork.JoinRandomRoom ();
 }
 void OnPhotonRandomJoinFailed(){
     PhotonNetwork.CreateRoom (null);
     Debug.Log ("creatingroom");
 }
 void OnJoinedRoom(){
     Debug.Log ("joinedroom");
     connecting = false;
     SpawnMyPlayer(teamID);
 }

 void Loadlevel(){
     connecting = true;
     Connect ();
 }


 void SpawnMyPlayer(int teamID){
     this.teamID = teamID;
     hasPickedTeam = true;
     Standby.SetActive (false);
     StandbyCam.SetActive (false);
     AddChatMessage ("Spawning player: " + PhotonNetwork.player.NickName);
     if (teamID == 1 ) {
         GameObject myPlayerGO = (GameObject)PhotonNetwork.Instantiate ("Sean", Vector3.zero, Quaternion.identity, 0);
         myPlayerGO.transform.FindChild ("Main Camera").gameObject.SetActive (true);
         myPlayerGO.GetComponent<TemporaryMove> ().enabled = true;
         myPlayerGO.GetComponent<NetworkCharacter> ().enabled = true;
         myPlayerGO.GetComponent<TeamMember> ().teamID = teamID;
         myPlayerGO.GetComponent<WeaponPickup> ().enabled = true;
     }
     if (teamID == 2) {
         GameObject myPlayerGO = (GameObject)PhotonNetwork.Instantiate ("SeanB", Vector3.zero, Quaternion.identity, 0);
         myPlayerGO.transform.FindChild ("Main Camera").gameObject.SetActive (true);
         myPlayerGO.GetComponent<TemporaryMove> ().enabled = true;
         myPlayerGO.GetComponent<NetworkCharacter> ().enabled = true;
         myPlayerGO.GetComponent<TeamMember> ().teamID = teamID;
     }
     if (teamID == 3) {
         GameObject myPlayerGO = (GameObject)PhotonNetwork.Instantiate ("SeanCom", Vector3.zero, Quaternion.identity, 0);
         myPlayerGO.transform.FindChild ("Main Camera").gameObject.SetActive (true);
         myPlayerGO.GetComponent<TemporaryMove> ().enabled = true;
         myPlayerGO.GetComponent<NetworkCharacter> ().enabled = true;
         myPlayerGO.GetComponent<TeamMember> ().teamID = teamID;
     }
     if (teamID == 4) {
         GameObject myPlayerGO = (GameObject)PhotonNetwork.Instantiate ("SeanO"  , Vector3.zero, Quaternion.identity, 0);
         myPlayerGO.transform.FindChild ("Main Camera").gameObject.SetActive (true);
         myPlayerGO.GetComponent<TemporaryMove> ().enabled = true;
         myPlayerGO.GetComponent<NetworkCharacter> ().enabled = true;
         myPlayerGO.GetComponent<TeamMember> ().teamID = teamID;
     }
 }

 void OnPlayerDisconnected(){
     AddChatMessage (PhotonNetwork.player.NickName + "Has Disconnected");
 }

 public void onspawnItem() {
     Vector3 itemSpawnLocations = new Vector3 (Random.Range(-25, 25), Random.Range (-12.5f, 12.5f), 0);
     PhotonNetwork.Instantiate ("Gun1", itemSpawnLocations, Quaternion.identity, 0);
     Debug.Log ("Item Spawned");
 }

} `