迁移到XCode 7.1后，我不能在iOS和tvOS平台上使用playground。只有OS X有效。最简单的操场代码会产生错误消息：
Unable to find execution service for selected run destination
我怀疑它与XCode没有找到合适的模拟器有关，但是我不知道在哪里以及如何配置它。
我在现有项目中尝试了游乐场，以及刚从启动画面中新创建的游乐场。
什么想法可能是错的？
更新：
检查控制台提供了更多的洞察力，但仍不清楚如何修复：
24/10/2015 10:16:10,193 lsd[279]: LaunchServices: Could not store lsd-identifiers file at /private/var/db/lsd/com.apple.lsdschemes.plist 24/10/2015 10:16:10,212 com.apple.usbmuxd[82]: LOCKDOWN_V2_BONJOUR_SERVICE_NAME is _apple-mobdev2._tcp,8de107c0 24/10/2015 10:16:10,248 Xcode[819]: DeveloperPortal: Using pre-existing current store at URL (file:///Users/courteouselk/Library/Developer/Xcode/DeveloperPortal%207.1.db). 24/10/2015 10:16:10,381 com.apple.CoreSimulator.CoreSimulatorService[461]: Requested phone is is not available for pairing. Assuming it has the capability. 24/10/2015 10:16:10,384 com.apple.CoreSimulator.CoreSimulatorService[461]: Requested phone is is not available for pairing. Assuming it has the capability. 24/10/2015 10:16:12,929 com.apple.usbmuxd[82]: _SendAttachNotification Device 80:ea:96:04:a5:da@fe80::82ea:96ff:fe04:a5da._apple-mobdev2._tcp.local. has already appeared on interface 4. Suppressing duplicate attach notification. 24/10/2015 10:16:13,311 GPUToolsAgent[832]: Mac Agent inited !!! 24/10/2015 10:16:14,287 Xcode[819]: <DYMobileDevice: 0x7ffbfd6b6320>: Failed to acquire service transport reservation: Error Domain=DYAMDErrorDomain Code=-402653150 "(null)" 24/10/2015 10:16:14,447 Xcode[819]: [MT] IDEPlaygroundEditor: Error encountered attempting to run playground: Error Domain=IDEPlaygroundErrorDomain Code=1 "Unable to find execution service for selected run destination." UserInfo={NSLocalizedDescription=Unable to find execution service for selected run destination.} 24/10/2015 10:16:19,672 mdworker[255]: LaunchServices: received XPC_ERROR_CONNECTION_INTERRUPTED trying to map database 24/10/2015 10:16:19,672 mdworker[255]: LaunchServices: Database mapping Failed with result -10822,retrying 24/10/2015 10:16:19,673 mdworker[255]: LaunchServices: received XPC_ERROR_CONNECTION_INTERRUPTED trying to map database 24/10/2015 10:16:19,673 mdworker[255]: LaunchServices: Database mapping Failed with result -10822,674 mdworker[255]: LaunchServices: received XPC_ERROR_CONNECTION_INTERRUPTED trying to map database 24/10/2015 10:16:19,674 mdworker[255]: LaunchServices: Database mapping Failed with result -10822,675 mdworker[255]: LaunchServices: received XPC_ERROR_CONNECTION_INTERRUPTED trying to map database 24/10/2015 10:16:20,497 Xcode[819]: CompanionProxy: _SocketReadCallback:128 (0x0x700000117000): Failed to receive response from AMDevice 0x7ffbfe60cad0 {UDID = e4bfce5e11be0bcf730ada45b4d6ae81f1abdb01,device ID = 23,FullServiceName = 80:ea:96:04:a5:da@fe80::82ea:96ff:fe04:a5da._apple-mobdev2._tcp.local.}: 0xe8000084 24/10/2015 10:16:20,497 Xcode[819]: CompanionProxy: _SocketReadCallback:200 (0x0x700000117000): Stopped listening for paired devices from AMDevice 0x7ffbfe60cad0 {UDID = e4bfce5e11be0bcf730ada45b4d6ae81f1abdb01,FullServiceName = 80:ea:96:04:a5:da@fe80::82ea:96ff:fe04:a5da._apple-mobdev2._tcp.local.}: 0xe8000084
