Error cs0535 unity

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#if (UNITY_ANDROID || (UNITY_IPHONE && !NO_GPGS))
 
namespace GooglePlayGames
{
    using System;
    using GooglePlayGames.BasicApi;
    using UnityEngine.SocialPlatforms;
 
    /// <summary>
    /// Represents the Google Play Games local user.
    /// </summary>
    public class PlayGamesLocalUser : PlayGamesUserProfile, ILocalUser
    {
        internal PlayGamesPlatform mPlatform;
 
        private string emailAddress;
 
        private PlayerStats mStats;
 
        internal PlayGamesLocalUser(PlayGamesPlatform plaf)
            : base("localUser", string.Empty, string.Empty)
        {
            mPlatform = plaf;
            emailAddress = null;
            mStats = null;
        }
 
        /// <summary>
        /// Authenticates the local user. Equivalent to calling
        /// <see cref="PlayGamesPlatform.Authenticate" />.
        /// </summary>
        public void Authenticate(Action<bool> callback)
        {
            mPlatform.Authenticate(callback);
        }
 
        /// <summary>
        /// Authenticates the local user. Equivalent to calling
        /// <see cref="PlayGamesPlatform.Authenticate" />.
        /// </summary>
        public void Authenticate(Action<bool> callback, bool silent)
        {
            mPlatform.Authenticate(callback, silent);
        }
 
        /// <summary>
        /// Loads all friends of the authenticated user.
        /// </summary>
        public void LoadFriends(Action<bool> callback)
        {
            mPlatform.LoadFriends(this, callback);
        }
 
        /// <summary>
        /// Synchronous version of friends, returns null until loaded.
        /// </summary>
        public IUserProfile[] friends
        {
            get
            {
                return mPlatform.GetFriends();
            }
        }
 
        /// <summary>
        /// Gets an id token for the user.
        /// NOTE: This property can only be accessed using the main Unity thread.
        /// </summary>
        /// <param name="idTokenCallback"> A callback to be invoked after token is retrieved. Will be passed null value
        /// on failure. </param>
        [Obsolete("Use PlayGamesPlatform.GetServerAuthCode()")]
        public void GetIdToken(Action<string> idTokenCallback)
        {
            if(authenticated)
                mPlatform.GetIdToken(idTokenCallback);
            else
                idTokenCallback(null);
        }
 
        /// <summary>
        /// Returns whether or not the local user is authenticated to Google Play Games.
        /// </summary>
        /// <returns>
        /// <c>true</c> if authenticated; otherwise, <c>false</c>.
        /// </returns>
        public bool authenticated
        {
            get
            {
                return mPlatform.IsAuthenticated();
            }
        }
 
        /// <summary>
        /// Not implemented. As safety placeholder, returns true.
        /// </summary>
        public bool underage
        {
            get
            {
                return true;
            }
        }
 
        /// <summary>
        /// Gets the display name of the user.
        /// </summary>
        /// <returns>
        /// The display name of the user.
        /// </returns>
        public new string userName
        {
            get
            {
                string retval = string.Empty;
                if (authenticated)
                {
                    retval = mPlatform.GetUserDisplayName();
                    if (!base.userName.Equals(retval))
                    {
                        ResetIdentity(retval, mPlatform.GetUserId(), mPlatform.GetUserImageUrl());
                    }
                }
                return retval;
            }
        }
 
        /// <summary>
        /// Gets the user's Google id.
        /// </summary>
        /// <remarks> This id is persistent and uniquely identifies the user
        ///     across all games that use Google Play Game Services.  It is
        ///     the preferred method of uniquely identifying a player instead
        ///     of email address.
        /// </remarks>
        /// <returns>
        /// The user's Google id.
        /// </returns>
        public new string id
        {
            get
            {
                string retval = string.Empty;
                if (authenticated)
                {
                    retval = mPlatform.GetUserId();
                    if (!base.id.Equals(retval))
                    {
                        ResetIdentity(mPlatform.GetUserDisplayName(), retval, mPlatform.GetUserImageUrl());
                    }
                }
                return retval;
            }
        }
 
        /// <summary>
        /// Gets an access token for the user.
        /// NOTE: This property can only be accessed using the main Unity thread.
        /// </summary>
        /// <returns>
        /// An id token for the user.
        /// </returns>
        [Obsolete("Use PlayGamesPlatform.GetServerAuthCode()")]
        public string accessToken
        {
            get
            {
                return authenticated ? mPlatform.GetAccessToken() : string.Empty;
            }
        }
 
        /// <summary>
        /// Returns true (since this is the local user).
        /// </summary>
        public new bool isFriend
        {
            get
            {
                return true;
            }
        }
 
        /// <summary>
        /// Gets the local user's state. This is always <c>UserState.Online</c> for
        /// the local user.
        /// </summary>
        public new UserState state
        {
            get
            {
                return UserState.Online;
            }
        }
 
 
        public new string AvatarURL
        {
            get
            {
                string retval = string.Empty;
                if (authenticated)
                {
                    retval = mPlatform.GetUserImageUrl();
                    if (!base.id.Equals(retval))
                    {
                        ResetIdentity(mPlatform.GetUserDisplayName(),
                            mPlatform.GetUserId(), retval);
                    }
                }
                return retval;
            }
        }
 
        /// <summary>Gets the email of the signed in player.</summary>
        /// <remarks>If your game requires a persistent, unique id for the
        /// player, the use of PlayerId is recommendend since it does not
        /// require extra permission consent from the user.
        /// This is only available if the Requires Google Plus option
        /// is added to the setup (which enables additional
        /// permissions for the application).
        /// NOTE: This property can only be accessed using the main Unity thread.
        /// </remarks>
        /// <value>The email.</value>
        public string Email
        {
            get
            {
                // treat null as unitialized, empty as no email.  This can
                // happen when the web client is not initialized.
                if (authenticated && string.IsNullOrEmpty(emailAddress))
                {
                    emailAddress = mPlatform.GetUserEmail();
                    emailAddress = emailAddress ?? string.Empty;
                }
                return authenticated ? emailAddress : string.Empty;
            }
        }
 
        /// <summary>
        /// Gets the player's stats.
        /// </summary>
        /// <param name="callback">Callback when they are available.</param>
        public void GetStats(Action<CommonStatusCodes, PlayerStats> callback)
        {
            if (mStats == null || !mStats.Valid)
            {
                mPlatform.GetPlayerStats((rc, stats) =>
                    {
                        mStats = stats;
                        callback(rc, stats);
                    });
            }
            else
            {
                // 0 = success
                callback(CommonStatusCodes.Success, mStats);
            }
        }
    }
}
#endif

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public class PlayGamesPlatform : ISocialPlatform