MethodAccessException: Attempt to access a private/protected method failed.

MethodAccessException: Attempt to access a private/protected method failed. at System.Security.SecurityManager.ThrowException (System.Exception ex) [0x00000] in :0

at ProfileManager..ctor () [0x00000] in :0 UnityEngine.GameObject:Internal_AddComponentWithType(Type) UnityEngine.GameObject:AddComponent(Type) UnityEngine.GameObject:.ctor(String, Type[]) MonoSingleton`1:get_instance() MainMenus:RefreshUsernameCache()

Had this in web player, however no issues in the PC version. Any idea how to fix this? This is the code for the singleton.

 using UnityEngine;
 public abstract class MonoSingleton<T> : MonoBehaviour where T : MonoSingleton<T>
 {
     private static T m_Instance = null;
     public static T instance
     {
         get
         {
             // Instance requiered for the first time, we look for it
             if( m_Instance == null )
             {
                 m_Instance = GameObject.FindObjectOfType(typeof(T)) as T;
  
                 // Object not found, we create a temporary one
                 if( m_Instance == null )
                 {
                     Debug.LogWarning("No instance of " + typeof(T).ToString() + ", a temporary one is created.");
                     m_Instance = new GameObject("Temp Instance of " + typeof(T).ToString(), typeof(T)).GetComponent<T>();
  
                     // Problem during the creation, this should not happen
                     if( m_Instance == null )
                     {
                         Debug.LogError("Problem during the creation of " + typeof(T).ToString());
                     }
                 }
                 m_Instance.Init();
             }
             return m_Instance;
         }
     }
     
     public T GetInstance()
     {
         return m_Instance;
     }
     
     // If no other monobehaviour request the instance in an awake function
     // executing before this one, no need to search the object.
     private void Awake()
     {
         if( m_Instance == null )
         {
             m_Instance = this as T;
             m_Instance.Init();
         }
     }
  
     // This function is called when the instance is used the first time
     // Put all the initializations you need here, as you would do in Awake
     public virtual void Init(){}
  
     // Make sure the instance isn't referenced anymore when the user quit, just in case.
     private void OnApplicationQuit()
     {
         m_Instance = null;
     }
 }