Failed to login: Invalid session(try restarting your game and the launcher)

I've been trying to play minecraft multiplayer for many hours, but I keep getting the error: "Failed to login: Invalid session(try restarting your game and the launcher)", I tried restarting the pc, restart the game + the launcher , I tried disabling the antivirus, I tried using another connection, I tried using a different computer but the problem persists.
Is there anyone who can help me? I am desperate!
Oh (I have minecraft Premium!).