Hello Death by Snu Snu, it seems like the texture pack is just not downloading for you which is why it will not let you access PokeWorld. Please click here for a guide to fix that issue, and you should be able to join from there! If you have anymore questions or concerns, feel free to message me on here or on discord.
what uv hail wrote kinda makes sense but i just had the texture pack reloaded and did /hub and rejoined pokemon world and it got fixed