Unable to automate Safari on iPad 2 and iPhone 4

Hello,

I am not able to automate Safari on iPad 2 and iPhone 4 having iOS 7.*. It starts safari launcher but failing with below error message :

Instruments crashed on startup
info: [debug] [INST] 2015-02-27 12:11:26 +0000 Fail: Could not start script, target application is not frontmost.
info: [debug] [INST] Instruments Trace Complete (Duration : 14.153864s; Output : /tmp/appium-instruments/instrumentscli0.trace)

error: Failed to start an Appium session, err was: Error: Instruments crashed on startup
info: [debug] Error: Instruments crashed on startup
at Instruments.onInstrumentsExit (/Users/mobileautomation/Documents/Appium-repo/appium/node_modules/appium-instruments/lib/instruments.js:389:31)
at null. (/Users/mobileautomation/Documents/Appium-repo/appium/node_modules/appium-instruments/lib/instruments.js:308:12)
at ChildProcess.emit (events.js:110:17)
at Process.ChildProcess._handle.onexit (child_process.js:1067:12)
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}

Are there any possibilities to automate Safari on iPad 2 and iPhone 4 real devices?

I am using latest version of Appium (1.3.5). I can automate Safari on other real iOS devices without any issues.

Thanks,
Paresh