RiftRealms

I created a thread earlier and Im too busy to close it as I had the issue fixed but now I re made it and I get the message "A fatal error has occurred, connection terminated" when joining my server. Heres the dropbox link our server/pack uses https://www.dropbox.com/s/lkxl6tr6mhvf7zg/modpack.zip?dl=0. Thanks for any help in advance that you can give. <3