WordPress wp admin isn′t working

Hello, I’m having such a problem that my page won’t load at all. I needed to switch the divi theme to a wordpress theme to see what is the fault of the pagination plugin and now I can’t do anything with the page and it says this:
“The Divi Responsive Helper plugin only works with Divi Theme, Extra Theme or Divi Builder plugin only. Your current active theme is Twenty Nineteen. The plugin will be deactivated and you may return to your WordPress dashboard.”
Normally I would change the theme or disable the plugin, but the problem is that I can’t even get into wp-admin. I can’t do anything at all. I’ve also tried through the wordpress app, but nothing works.

The page I need help with: [log in to see the link]