app installation failed : INSTALL_PRASE_FAILED_NO_CERTIFICATES

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:bust_in_silhouette: Asked By godotboy007

hi there hope you all okey .
am working on game and i tried to export apk the things is sometime work sometime not and its give me that " app installation failed : INSTALL_PRASE_FAILED_NO_CERTIFICATES "
i make change its not work i delete the change i do its work i do the same change its work and after some time its back to the same error , any idea where should i look or what may cause this error . thanks