What is this error

unable to install because of an error in the app apk. we recomnded installing only certified apps from the play store

This is not error it is security feature from Google it will always
Come if you install app from anywhere except play store

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If it is your own application you can proceed further by clicking “install anyway”

but install nahi ho rahi hey can u help

Please post on English language…
Post error screenshots…
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post screenshot of whats happening out there

Turn on “Install from Unknown Sources” in settings.
Turn Off Data/WiFi connection and then try installing.
If you still get that message click INSTALL ANYWAY, Your app will be installed.