通过添加以下行，并在Facebook的SDK使用 getAccessTokenFrom code ，
问题可以得到解决。

By adding the following line and using getAccessTokenFromCode in Facebook SDK, the problem can be resolved.

该acesss code到期。因此，通过交换code获得新的访问code可以解决该问题。

The acesss code expires. So getting new access code by exchanging code resolves the problem

$ access_ code = $ facebook-＆GT; getAccessTokenFrom code（$ _ GET ['code']）;