检查权限，如下图所示.转到开发者帐户->仪表板->选择您的应用->权限.

Check permission as follow screenshot. Goto developer account -> Dashboard -> select your app -> Permissions.

是使用纯应用程序身份验证还是仅具有只读权限的应用程序?

Would it be the case that you are using app-only authentication, or an app which has only read-only permissions?

请确保您的应用具有读写访问权限或阅读，编写和直接发送消息访问权限

Please make sure your app has a read-write access OR Read, write, and direct messages access