Realms pixel party and others not working

When i Join Pixel party or Pixel party 2 (on realms) it says "an error occurred" So i downloaded the map and uploaded it onto a realms world, but when i tried to join again it said something like "an error occurred" So i downloaded the map and tried to join in my singleplayer world. But then it said there was an error with the datapack, and it had 2 buttons, one was for returning to the main menu and the other one was playing without the datapack. When i pressed without the datapack i could join the world, the map was there but i couldn't press any buttons or do anything. It worked about 4 months ago but then suddenly it stopped working. Also a few other maps had this but i dident look if it were datapack problems or not.