Nothing shows in the page

cannie

Hello! Something is wrong with my flarum. Nothing shows in my page. An error message shows in the console like this:
forum-7bc9416a.js:18591 Uncaught TypeError: patchMithril is not a function
at ForumApp.App (forum-7bc9416a.js:18591)
at new ForumApp (forum-7bc9416a.js:28482)
at Object.execute (forum-7bc9416a.js:18542)
at Object.execute (forum-7bc9416a.js:709)
at ensuredExecute (forum-7bc9416a.js:596)
at Object.get (forum-7bc9416a.js:606)
at (index):107
Does anybody know what is the problem and how to fixed? Please!

luceos

When did this issue arise, is this a new installation or did you recently install an extension?