public static void Prexport() {
        Debug.Log("XXX Prexport");


        Debug.Log("Data path is: " + Application.dataPath);

        string libraryPath = Application.dataPath.Replace("/Assets", "/Library");

        string facebookSDKPath = libraryPath + "/FacebookSDK";

        Debug.Log(facebookSDKPath);

        if (Directory.Exists(facebookSDKPath)) {
            Directory.Delete(facebookSDKPath, true);
        }
        else {
            Debug.Log("Facebook directory does not exist in the library folder");
        }

    }