Just don't request a second jump. Be patient. And wait for the first jump to happen. The first jump request was received by the server. But sometimes, for whatever reason, it just takes it a while before it starts to happen. Zone is too full? I don't know why. But requesting a second jump just means that it'll interrupt the first jump and now you lose both jumps and end up spending more time than if you just stood there waiting for the first one to finally happen.