Solution
For “Error: -1” if you are in a party, one reason can be that if the leader loads in the game fast (has good connection/internet), and one of the other players in your party have a bad connection/internet.
The error will occur, probably due to not taking into account that others in your party have to load first, before preceding to enter the match.
So the solution is to let the worst connection player be the leader!
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