PagePost 2 problem: The PagePost RPC was not ready!

PagePost 2: https://blog.coolcode.cn/?p=115

I tested this plugin on my localhost and works fine, but on my live site it gave me that error (“The PagePost RPC was not ready!”)

I’ll add the plugin here, since his site is really slow: https://ultrashare.net/hosting/fl/6cf44ad56d/

Any help appreciated. My blog is on a directory, not in the root.