Installation failed with message INSTALL_PARSE_FAILED_MANIFEST_MALFORMED. It is possible that this issue is resolved by uninstalling an existing version of the apk if it is present, and then re-installing. WARNING: Uninstalling will remove the application data! Do you want to uninstall the existing application? please help me
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Try to check these :
- Activity name should be prefixed with "." in your manifest file
Check if you don't have a taskAffinity attribute without dot :
android:taskAffinity=".string"
Your package name use only lowercase
This error can be cause by a lot of different mistake in your manifest.xml file. Check this file carrefuly...

Laurent
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everything must be check sir but don't no what are problem facing right now – Arunkumar shetti Dec 26 '16 at 10:23
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1. remove cache file from ur phone and android studio contain invalidate file remove...my suggestion is every time running your app clean and rerun. – Arunkumar shetti Mar 23 '17 at 12:52