boot2docker用start| 运行 info| stop| delete参数导致错误消息：

snowch$ boot2docker start
error in run: Failed to get machine "boot2docker-vm": machine does not exist    
snowch$ boot2docker info
error in run: Failed to get machine "boot2docker-vm": machine does not exist
snowch$ boot2docker stop
error in run: Failed to get machine "boot2docker-vm": machine does not exist
snowch$ boot2docker delete
error in run: Failed to get machine "boot2docker-vm": machine does not exist

该init错误是略有不同

snowch$ boot2docker init
error in run: Failed to initialize machine "boot2docker-vm": exit status 1

我怎样才能解决这个问题？