biomes o plenty encountered an error during the load_registries event phase

Heyo - My name's Carys and I've been working with modded minecraft for a few years now. My friends and I wanted to make a 1.16.4 modded server the other day (serverminer.com) and it was successful. My mods worked perfectly fine, I logged onto the multiplayer, played for a few hours. This morning when I woke up, I tried to open the mods again, and it gave me 'biomes o plenty encountered an error during the load_registries event phase.' I had changed nothing. I tried checking my forge was up to date, which it is. I tried redownloading/installing the mod. I searched through the error reports. I CAN NOT FIGURE THIS OUT! Please help :/ I've never had an issue like this before. If you want the crash report heres the pastebin for it : https://pastebin.com/PSZF86Me