Please help, Fatal error: Uncaught Error: Call to undefined function get_filesys

The link is working fine, Please elaborate the issue.

You’ve linked us to your wp-admin page. Can you re-upload the screenshot please ??

Please attempt to disable all plugins, and use one of the default (Twenty*) themes. If the problem goes away, enable them one by one to identify the source of your troubles.

If you cannot access wp-admin, there are other ways to deactivate plugins.

I managed to fix it in the end, thanks