Appium [iOS] Instruments crashed on startup - ios

Question

When Appium tries to run application, the screen flashes with app splash screen, as if Appium tries to launch app multiple times. This behaviour happens both on simulator and real device.
I set enable on my iOS devices UI Automation, but when I try start inspector I have this problem:
info: [debug] [INST STDERR] 2015-11-05 15:11:05.082 instruments[1495:39489] WebKit Threading Violation - initial use of WebKit from a secondary thread.
info: [debug] [INST STDERR] 2015-11-05 15:11:06.049 instruments[1495:39460] Attempting to change event horizon while disengage
error: Failed to start an Appium session, err was: Error: Instruments crashed on startup
info: [debug] [INST STDERR] 2015-11-05 15:11:06.049 instruments[1495:39462] Attempting to change event horizon while disengage
Instruments Trace Error : Target failed to run: Permission to debug com.myapp.iphone was denied. The app must be signed with a development identity (e.g. iOS Developer).
info: [IOS_SYSLOG_ROW ] Nov 5 15:11:04 tests-iPod com.apple.xpc.launchd[1] (UIKitApplication:com.myapp.iphone[0xe163][607]) <Notice>: Service exited due to signal: Killed: 9
info: [debug] [INSTSERVER] Instruments exited with code 253
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] Reset not set, not ending sim or cleaning up app state
info: [debug] Cleaning up appium session
info: [debug] Error: Instruments crashed on startup
at [object Object].Instruments.onInstrumentsExit (/Applications/Appium.app/Contents/Resources/node_modules/appium/submodules/appium-instruments/lib/instruments.js:440:31)
at [object Object].<anonymous> (/Applications/Appium.app/Contents/Resources/node_modules/appium/submodules/appium-instruments/lib/instruments.js:353:12)
at ChildProcess.emit (events.js:110:17)
at Process.ChildProcess._handle.onexit (child_process.js:1074:12)
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 33841.937 ms - 182}
Application is in form of .ipa

Answer 1

Target failed to run: Permission to debug com.myapp.iphone was denied.
The app must be signed with a development identity (e.g. iOS Developer).
You application should be signed with developers key. Click here for documentation

Answer 2

If you are using iOS Simulator, do the following...
In Appium, go to Developer Settings, Check Custome Server Flags and write --native-instruments-lib in the text box.
Now start Appium Server.
Hope this helps!

Answer 3

BlockquoteTarget failed to run: Permission to debug com.myapp.iphone was denied.
The app must be signed with a development identity (e.g. iOS Developer).
Blockquote
You should give your developer identity while creating the .ipa...
If you are creating ipa file through terminal, you can follow the given link [blog]: Xcode "Build and Archive" from command line

Answer 4

I also struggled with this problem and found that you need to enable UI automation in developer option in you iDevice
How to enable UI Automation
1. switch off the iDevice,
2. then connect it to the Mac running Xcode
3. before switching it back on to have Developer options appear.
4. tap on developer option and Enable UI automation

Answer 5

In my case, the following command made my life hell:
rm -rf $HOME/Library/Developer/Xcode/iOS\ DeviceSupport/*
So don't add it to the build step.
To fix the issue:
Restart device > run Xcode > connect device > build & run the app > stop & quit Xcode
Now verify launching app without crashing the instruments.