Android Studio ERROR: 9-patch image

my english is not so god and my android studio skill :(

I become this error :

AAPT err(Facade for 1793161072): ERROR: 9-patch image C:PiewChatappsrcmainresdrawableleft.9.png malformed. AAPT err(Facade for 1793161072): No marked region found along edge. AAPT err(Facade for 1793161072): Found along left edge. Error:Execution failed for task ':mergeDebugResources'.

Some file crunching failed, see logs for details

What is this?