why Failure [INSTALL_FAILED_OLDER_SDK] Android Studio? -


i trying test app on sdk 17 . android studio error failure [install_failed_older_sdk] here android manifest:

apply plugin: 'com.android.application'  android {     compilesdkversion 22     buildtoolsversion "22.0.1"      defaultconfig {         applicationid "com.sample.exams"         minsdkversion 17         targetsdkversion 22         versioncode 1         versionname "1.0"     }     buildtypes {         release {             minifyenabled false             proguardfiles getdefaultproguardfile('proguard-android.txt'), 'proguard-rules.pro'         }     } }  dependencies {     compile filetree(dir: 'libs', include: ['*.jar'])     compile 'com.android.support:appcompat-v7:22.0.0'     compile 'com.android.support:support-v4:22.0.0'     compile 'com.android.support:support-v4:22.1.1'     compile project(':library') } 


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