Failure [INSTALL_FAILED_OLDER_SDK]

The reason to get this error is your app installation device didn't supporting..

In your project structure 

OPen app folder

edit build.gradle  as below

    defaultConfig {

        applicationId "www.standardservices.manibiz.myapplication"

        minSdkVersion 8

        targetSdkVersion 21

        versionCode 1

        versionName "1.0"

    }