Can't join gportal server

Hello dear community, My friends hosted a server of Gportal. They are all playing on it but when i add the exact same ip it shows another server and If i try joining it. The message beneath pops up. Any ideas on how to fix this?

https://preview.redd.it/hhmby4v2t54c1.png?width=671&format=png&auto=webp&s=16c32e5ed22043a6f42c87002f51ef0455f7749d