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Appium 1.3.1 : simulator crashes on start

See original GitHub issue

How to resolve - “Instruments Usage Error : Ambiguous device name/identifier ‘iPhone 5s (8.1 Simulator)’:” ? There are couple of simulator types, which one should be used? [I had added “iPhone 5s” in desired Capability ], strangely, the same had worked once.

Xcode-6.1

info: [debug] And launch timeouts (in ms): {"global":90000}

info: [debug] [INST STDERR] Instruments Usage Error : Ambiguous device name/identifier 'iPhone 5s (8.1 Simulator)':
iPhone 5s (8.1 Simulator) [6CF8569C-C303-4137-AC6E-D9EDED164A94]
iPhone 5s (8.1 Simulator) [AAAB7161-45F9-4628-A3A9-DF3CF7E2212E]

info: [debug] [INSTSERVER] Instruments exited with code 255

info: [debug] Killall instruments

info: [debug] Instruments crashed on startup
info: [debug] We exceeded the number of retries allowed for instruments to successfully start; failing launch
info: [debug] Stopping iOS log capture
info: [debug] Running ios sim reset flow
info: [debug] Killing the simulator process
info: [debug] Killall iOS Simulator
info: [debug] Killing any other simulator daemons

info: [debug] Cleaning sim data files

info: [debug] Executing: xcrun simctl erase 6CF8569C-C303-4137-AC6E-D9EDED164A94

info: [debug] Executing: xcrun simctl erase 6CF8569C-C303-4137-AC6E-D9EDED164A94

info: [debug] Executing: xcrun simctl erase 6CF8569C-C303-4137-AC6E-D9EDED164A94

info: [debug] Executing: xcrun simctl erase 6CF8569C-C303-4137-AC6E-D9EDED164A94

info: [debug] Executing: xcrun simctl erase 6CF8569C-C303-4137-AC6E-D9EDED164A94

error: Could not reset simulator. Leaving as is. Error: Command failed:  // stderr: 

info: [debug] Cleaning app data files

error: Failed to start an Appium session, err was: Error: Instruments crashed on startup

warn: Applications directory /Users/pooja/Library/Developer/CoreSimulator/Devices/6CF8569C-C303-4137-AC6E-D9EDED164A94/data/Applications doesn't exist. Have you run this simulator before?
info: Couldn't find app directories to delete. Probably it's not installed
info: [debug] Cleaning up appium session
info: [debug] Error: Instruments crashed on startup
    at Instruments.onInstrumentsExit (/Applications/Appium.app/Contents/Resources/node_modules/appium/node_modules/appium-instruments/lib/instruments.js:387:31)
    at null.<anonymous> (/Applications/Appium.app/Contents/Resources/node_modules/appium/node_modules/appium-instruments/lib/instruments.js:308:12)
    at ChildProcess.emit (events.js:98:17)
    at Process.ChildProcess._handle.onexit (child_process.js:810:12)
info: [debug] Responding to client with error: {"status":33,"value":{"message":"A new session could not be created. (Original error: Instruments crashed on startup)","origValue":"Instruments crashed on startup"},"sessionId":null}

info: <-- POST /wd/hub/session 500 23770.121 ms - 182