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

**URL:** <https://discuss.appium.io/t/failed-to-start-an-appium-session-err-was-error-instruments-crashed-on-startup/10784>\
**Category:** Support\
**Created:** [June 17, 2016, 6:56am UTC](https://discuss.appium.io/t/failed-to-start-an-appium-session-err-was-error-instruments-crashed-on-startup/10784 "2016-06-17T06:56:08Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![test\_user](https://discuss.appium.io/user_avatar/discuss.appium.io/test_user/32/5378_2.png) [@test\_user](https://discuss.appium.io/u/test_user)\
**Post date:** [June 17, 2016, 6:56am UTC](https://discuss.appium.io/t/failed-to-start-an-appium-session-err-was-error-instruments-crashed-on-startup/10784/1 "2016-06-17T06:56:08Z")

</div>

Hi Guys,

below is the code.help me ASAp

info: Launching instruments  
info: [debug] Attempting to run app on real device with UDID 83af28cf7697e063c234812bdb7f291a8f6bf6a0  
info: [debug] Spawning instruments with command: /Applications/Xcode.app/Contents/Developer/usr/bin/instruments -t /Applications/Xcode.app/Contents/Applications/Instruments.app/Contents/PlugIns/AutomationInstrument.xrplugin/Contents/Resources/Automation.tracetemplate -D /tmp/appium-instruments/instrumentscli0.trace -w 83af28cf7697e063c234812bdb7f291a8f6bf6a0 org.ifad.meetings -e UIASCRIPT “/Users/siddeshbelura/Library/Application Support/appium/bootstrap/bootstrap-5923cadea0343e3f.js” -e UIARESULTSPATH /tmp/appium-instruments  
info: [debug] And extra without-delay env: {}  
info: [debug] And launch timeouts (in ms): {“global”:90000}  
info: [IOS\_SYSLOG\_ROW] Jun 17 11:45:04 IFAD com.apple.xpc.launchd1 : assertion failed: 13F69: launchd + 116796 [9F6284CF-8A17-36CC-9DB5-85D510A21F14]: 0x3  
info: [debug] [INST STDERR] 2016-06-17 11:45:04.866 instruments[3039:733831] WebKit Threading Violation - initial use of WebKit from a secondary thread.  
info: [debug] [INST STDERR] Instruments Usage Error: Specified target process is invalid: org.ifad.meetings  
instruments, version 7.3 (60133)  
usage: instruments [-t template] [-D document] [-l timeLimit] [-i #] [-w device] [[-p pid] | [application [-e variable value] [argument …]]]  
info: [debug] [INSTSERVER] Instruments exited with code 255  
info: [debug] Killall instruments  
info: [debug] Instruments crashed on startup  
info: [debug] Attempting to retry launching instruments, this is retry #3  
info: [debug] Killall iOS Simulator  
info: [IOS\_SYSLOG\_ROW] Jun 17 11:45:05 IFAD gputoolsd[262] : schedule invalidation \<DYTransport 0x14fe08ca0, error: lost transport connection (31)\>  
info: [IOS\_SYSLOG\_ROW] Jun 17 11:45:05 IFAD gputoolsd[262] : terminating daemon 0x14fe03690  
info: [IOS\_SYSLOG\_ROW] Jun 17 11:45:05 IFAD DTServiceHub[260] : Could not create service named com.apple.instruments.server.services.processcontrol.posixspawn  
info: [IOS\_SYSLOG\_ROW] Jun 17 11:45:05 IFAD notification\_proxy[164] : 0x16e12f000 -[MNPLockdownConnection receiveMessage]: lockdown\_receive\_message error!