I had this problem with my subscriptions until earlier this morning. It appears that clearing the app’s cache fixed it for me. If you go to mlem’s settings tab, you’ll find it on the bottom of the General settings page. Tap the rectangle and then return to the feeds tab. In my case, the articles loaded without an error.
That’s awesome! Perhaps I have a future in screenwriting? Too bad the SAG is still on strike.
😊