When I first tried to load up a new world with Tiny Mob Farm (Mob for short) and Immersive Portals (Portals for short) I noticed that Portals was not working but Mob was so I exited the game to take out Portals only. when I came back I looked to see if Portals was out and then suddenly Mob wasn't working and said, "Made for an older version of Minecraft." I will admit I was in 1.16.5 the entire time however, when I went to "Older versions" of Forge from 1.16.3 to 1.16.5. I even tried the 1.16.3 and the 1.16.4 versions on Mob on "Older Versions" of Forge and got no results. I will keep trying but I know Einstein's definition of insanity.