net.minecraft.class_4355 error when trying to connect to a realm

I load minecraft, click on realms. Sometimes the realms page does not load and it gives me some unknown error 503 or 504 or 500 and I can't play realms. When the realms page loads I can't connect as it gives me "net.minecraft.class_4355" error. Playing on fabric 1.20.1 and using mods for fabric 1.20.1