Stuck on 'Loading Terrain...' on Paper Survival Server

  • So after the modpack server me and my friend decided to start our first minecraft survival series. And since I know how to set up the server, I made the server. After about 6 videos of gameplay, I wanted to make another video. I tried logging onto the server, and I was stuck on 'Loading Terrain...' but the server thought I was in.

    I tried:

    Trying again, 6 times

    Backing up and deleting my player save data

    Waiting 15 minutes

    And since my and my friend already done so much progress, I don't want to regenerate the world.

    What should I do?