swift-Xcode7.1新建playground报错Unable to find execution service for selected run destination

用Xcode7.1新建playground界面直接报错

Unable to find execution service for selected run destination
  • 解决方法
  • 1.关闭Xcode
  • 2.在终端执行两行代码
rm -rf ~/Library/Developer/CoreSimulator/Devices
killall -9 com.apple.CoreSimulator.CoreSimulatorService

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