你好，我按照您的第二种方法操作。我删除了第二个站点的数据库，并恢复了 app.yml 配置文件。但我不清楚如何从共享文件夹中移除第二个站点的资源文件，您能帮忙吗？
当我升级 Discourse 时，插件页面显示为空白，控制台报错如下：
Uncaught TypeError: Cannot read property 'extend' of undefined
at _discourse-rss-poster-422da9e50d576ad45cb7287315e7a35550af3708eb68422bee05813edc01521d.js:188
at t.module.exports.u.<computed> (_ember_jquery-1ed3f3559e6f967733b4088aa729ff7039dff2c09c5a5f787a214b016f58aabc.js:74640)
at t.module.exports.u.<computed> (_ember_jquery-1ed3f3559e6f967733b4088aa729ff7039dff2c09c5a5f787a214b016f58aabc.js:74470)
at require (_ember_jquery-1ed3f3559e6f967733b4088aa729ff7039dff2c09c5a5f787a214b016f58aabc.js:74637)
at t.customResolve (_application-572c27eef10b724b244ce26553c6fe92b75f44172387b25ef144f338da4faa1e.js:1015)
at t.resolveRoute (_application-572c27eef10b724b244ce26553c6fe92b75f44172387b25ef144f338da4faa1e.js:1051)
at t.e [as resolveRoute] (_ember_jquery-1ed3f3559e6f967733b4088aa729ff7039dff2c09c5a5f787a214b016f58aabc.js:43433)
at t.n.resolve (_ember_jquery-1ed3f3559e6f967733b4088aa729ff7039dff2c09c5a5f787a214b016f58aabc.js:46378)
at _ember_jquery-1ed3f3559e6f967733b4088aa729ff7039dff2c09c5a5f787a214b016f58aabc.js:12420
at e.t.resolve (_ember_jquery-1ed3f3559e6f967733b4088aa729ff7039dff2c09c5a5f787a214b016f58aabc.js:11959)
我认为问题出在第二个站点上，但不知道该如何修复。谢谢！