This has been a reoccurring issue for many years, and it’s gotten worse that I had to report this. Although the Festive Mash Up 2016 pack is pretty old, I used it a majority of the time. It was working up until last year when the texture pack itself wouldn’t load, nor would the world. EVERYTIME I tried getting on, the world would crash my system or display a message on the screen. I tried deleting and reinstalling MC, restarting my device, and even went to the extent of restoring my packs. I truly hope this gets resolved. I spent many hours and good money on this pack!