Some part of log were missed -
debug: Responding to client with success: {"status":0,"value":{"ELEMENT":"5000"},"sessionId":"bacab50c-ae9b-4aa7-bd80-9f705fe830f6"}
debug: Pushing command to appium work queue: "au.getElement('5000').rect()"
debug: Sending command to instruments: au.getElement('5000').rect()
debug: [INST] 2014-10-14 06:43:21 +0000 Debug: Got new command 2 from instruments: au.getElement('5000').rect()
debug: [INST] 2014-10-14 06:43:21 +0000 Debug: evaluating au.getElement('5000').rect()
debug: [INST] 2014-10-14 06:43:21 +0000 Error: TypeError: 'null' is not an object (evaluating 'au.getElement('5000').rect')
debug: Socket data received (91 bytes)
debug: Socket data being routed.
debug: Got result from instruments: {"status":17,"value":"'null' is not an object (evaluating 'au.getElement('5000').rect')"}
error: uncaughtException: Cannot read property 'x' of undefined date=Tue Oct 14 2014 12:13:23 GMT+0530 (IST), pid=1677, uid=502, gid=20, cwd=/Applications/Appium.app/Contents/Resources/node_modules/appium, execPath=/Applications/Appium.app/Contents/Resources/node/bin/node, version=v0.10.31, argv=[/Applications/Appium.app/Contents/Resources/node/bin/node, /Applications/Appium.app/Contents/Resources/node_modules/appium/lib/server/main.js, --command-timeout, 7200, --safari, --browser-name, Safari, --udid, 71025dee76d37d3fb8be2475f2b89705f80096d5, --device-name, iPad, --launch-timeout, 90000], rss=74637312, heapTotal=61307648, heapUsed=36827968, loadavg=[0.560546875, 0.65966796875, 0.5849609375], uptime=86025, trace=[column=36, file=/Applications/Appium.app/Contents/Resources/node_modules/appium/lib/devices/ios/ios-controller.js, function=, line=2106, method=null, native=false, column=43, file=/Applications/Appium.app/Contents/Resources/node_modules/appium/node_modules/async/lib/async.js, function=next, line=801, method=null, native=false, column=16, file=/Applications/Appium.app/Contents/Resources/node_modules/appium/node_modules/async/lib/async.js, function=null, line=32, method=null, native=false, column=9, file=/Applications/Appium.app/Contents/Resources/node_modules/appium/lib/devices/common.js, function=exports.respond, line=28, method=respond, native=false, column=18, file=/Applications/Appium.app/Contents/Resources/node_modules/appium/lib/devices/ios/ios.js, function=, line=1395, method=null, native=false, column=20, file=/Applications/Appium.app/Contents/Resources/node_modules/appium/node_modules/appium-uiauto/lib/command-proxy.js, function=getResultAndSendNext, line=134, method=null, native=false, column=7, file=/Applications/Appium.app/Contents/Resources/node_modules/appium/node_modules/appium-uiauto/lib/command-proxy.js, function=, line=88, method=null, native=false, column=20, file=events.js, function=Socket.emit, line=117, method=emit, native=false, column=16, file=_stream_readable.js, function=null, line=943, method=null, native=false, column=13, file=node.js, function=process._tickDomainCallback, line=463, method=_tickDomainCallback, native=false], stack=[TypeError: Cannot read property 'x' of undefined, at null. (/Applications/Appium.app/Contents/Resources/node_modules/appium/lib/devices/ios/ios-controller.js:2106:36), at next (/Applications/Appium.app/Contents/Resources/node_modules/appium/node_modules/async/lib/async.js:801:43), at /Applications/Appium.app/Contents/Resources/node_modules/appium/node_modules/async/lib/async.js:32:16, at exports.respond (/Applications/Appium.app/Contents/Resources/node_modules/appium/lib/devices/common.js:28:9), at null. (/Applications/Appium.app/Contents/Resources/node_modules/appium/lib/devices/ios/ios.js:1395:18), at getResultAndSendNext (/Applications/Appium.app/Contents/Resources/node_modules/appium/node_modules/appium-uiauto/lib/command-proxy.js:134:20), at Socket. (/Applications/Appium.app/Contents/Resources/node_modules/appium/node_modules/appium-uiauto/lib/command-proxy.js:88:7), at Socket.emit (events.js:117:20), at streamreadable.js:943:16, at process._tickDomainCallback (node.js:463:13)]