Recover to one site from multisite

Support Self-hosting
6

Hi, I follow your seconde method. I removed the database of the second site, and restored the app.yml config file. But I don’t know how to remove the second site assets from the shared folder, could you help me?

When I upgrade discourse, I got a empty page in plugin page, and error in console:

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)

I think it’s due to the second site but I don’t know how to fix it. Thanks!