App quits after launching.getting below error

Error while killing uiAutomator: Error: Unable to kill uiautomator processes. Original error: Error executing adbExec. Original error: ‘Command ‘/Users/abhisheksinha/Library/Android/sdk/platform-tools/adb -P 5037 -s ZY2242SRC2 shell kill -0 11428’ exited with code 1’; Stderr: ‘/system/bin/sh: kill: 11428: Operation not permitted’; Code: ‘1’
[UiAutomator] Moving to state ‘stopped’
[Logcat] Stopping logcat capture
[ADB] Running ‘/Users/abhisheksinha/Library/Android/sdk/platform-tools/adb -P 5037 -s ZY2242SRC2 shell am force-stop io.appium.unlock’
[AndroidDriver] Not cleaning generated files. Add clearSystemFiles capability if wanted.
[BaseDriver] Event ‘quitSessionFinished’ logged at 1540897094956 (16:28:14 GMT+0530 (IST))