How to fix App not installed Error in android

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How to fix App not installed Error in android-app not installed-app not installed for this user-application not installed.

I get the following error message while try to install the whatspp apk file:

App not installed.

This problem solution is common for android(trust me),tablets,bluestacks and the devices are samsung,micromax,sony,vivo,gionee,genymotion,panasonic,htc,lenovo,moto,nexus.

This method is also new 2016, and working for root,without root,no root,non rooted devices and the android versions are lollipop,marshmallow,kitkat.

Solution:

1.Goto google play store and then install apk editor app/aptoide

2.Now open it and locate that apk file and click to save option.

3.Finally again try to install the same whatsapp file.

4.The problem is solved.

Source: Youtube