Error about swarming

hello!Last week I followed http://ardupilot.org/planner/docs/swarming.html to control 2 quadcopters swarm(APM).But when the leader took off(using RC transmitter) and I clicked “Start”, the follower did nothing and the leader woreked out of control.Can anyone tell me what’s wrong?Thanks.
BTW,I’m using Mission Planner 1.3.32 and APM2.8

you need to be using the latest mission planner. please update

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OK.I’ll try it…