Failed to synchronize registry data from server, closing connection

  • Hi!

    I'm not very tech savvy, but this is the first time this issue has been brought up. My friends and I have been playing Pixelmon for a while on a 1.12.2-14.23.5 forge server, and things were going great. However, as our Aternos server updated to Pixelmon 9.0.6 which runs on a 1.16.5 forge server, I've tried to change to the new version. I was able to get all of the mods downloaded (there were only 3 mods that were required as far as I was aware: Pixelmon , Biomes 'o Plenty, and Nature's Compass), and I downloaded forge 1.16.5-36.2.34. But when I tried to go into the Pixelmon server, it gave me the error: "Failed to synchronize registry data from server, closing connection."

    I've tried to redownload all of the mods, delete my config files, and even change my version of forge to 1.16.5-36.2.39, but nothing seems to be working. Am I doing something wrong? Please help!

    Thank you.

    Here are my logs.

    Client log:

    Server log: