Cannot Contact Authentication Server

The game loads up fine, the mod and everything compiles and runs fine. No errors or bugs, besides not being able to load into a world.
The game crashes while joining any world.

Looked at the console and it says I joined the world correctly, but then it says "Ignoring chat session from Dev due to missing Services public key"
And then it says:
 "[Worker-Main-2/WARN] [mojang/YggdrasilMinecraftSessionService]: Couldn't look up profile properties for com.mojang.authlib.GameProfile@4a2442b2[id=380df991-f603-344c-a090-369bad2a924a,name=Dev,properties={},legacy=false]
com.mojang.authlib.exceptions.AuthenticationUnavailableException: Cannot contact authentication server"

Then there's just a bunch of errors involving URL connections and Yggdrasil Authentication Services.