error: Application not installed

i have build and application which is so simple. when i install that apk in virtual device, it installed successfully and run as it should be. But when i install the same APK (signed apk) in mobile device, it give the error "Application not installed". i have downloaded NDK and give its path in project structure as well. application is working properly in virtual device but not installing in real device. help! thanks in advance. following is the console output when i run application on virtual device.

`Executing tasks: [:app:generateDebugSources, :app:generateDebugAndroidTestSources, :app:mockableAndroidJar, :app:prepareDebugUnitTestDependencies]

Configuration on demand is an incubating feature. Incremental java compilation is an incubating feature. :app:preBuild UP-TO-DATE :app:preDebugBuild UP-TO-DATE :app:checkDebugManifest :app:preReleaseBuild UP-TO-DATE :app:prepareComAndroidSupportAnimatedVectorDrawable2600Alpha1Library :app:prepareComAndroidSupportAppcompatV72600Alpha1Library :app:prepareComAndroidSupportConstraintConstraintLayout102Library :app:prepareComAndroidSupportSupportCompat2600Alpha1Library :app:prepareComAndroidSupportSupportCoreUi2600Alpha1Library :app:prepareComAndroidSupportSupportCoreUtils2600Alpha1Library :app:prepareComAndroidSupportSupportFragment2600Alpha1Library :app:prepareComAndroidSupportSupportMediaCompat2600Alpha1Library :app:prepareComAndroidSupportSupportV42600Alpha1Library :app:prepareComAndroidSupportSupportVectorDrawable2600Alpha1Library :app:prepareComGoogleAndroidGmsPlayServicesAds1104Library :app:prepareComGoogleAndroidGmsPlayServicesAdsLite1104Library :app:prepareComGoogleAndroidGmsPlayServicesBase1104Library :app:prepareComGoogleAndroidGmsPlayServicesBasement1104Library :app:prepareComGoogleAndroidGmsPlayServicesClearcut1104Library :app:prepareComGoogleAndroidGmsPlayServicesGass1104Library :app:prepareComGoogleAndroidGmsPlayServicesSafetynet1104Library :app:prepareComGoogleAndroidGmsPlayServicesTasks1104Library :app:prepareDebugDependencies :app:compileDebugAidl UP-TO-DATE :app:compileDebugRenderscript :app:generateDebugBuildConfig UP-TO-DATE :app:generateDebugResValues UP-TO-DATE :app:generateDebugResources :app:mergeDebugResources :app:processDebugManifest :app:processDebugResources :app:generateDebugSources :app:preDebugAndroidTestBuild UP-TO-DATE :app:prepareComAndroidSupportTestEspressoEspressoCore222Library :app:prepareComAndroidSupportTestEspressoEspressoIdlingResource222Library :app:prepareComAndroidSupportTestExposedInstrumentationApiPublish05Library :app:prepareComAndroidSupportTestRules05Library :app:prepareComAndroidSupportTestRunner05Library :app:prepareDebugAndroidTestDependencies :app:compileDebugAndroidTestAidl UP-TO-DATE :app:processDebugAndroidTestManifest UP-TO-DATE :app:compileDebugAndroidTestRenderscript UP-TO-DATE :app:generateDebugAndroidTestBuildConfig UP-TO-DATE :app:generateDebugAndroidTestResValues UP-TO-DATE :app:generateDebugAndroidTestResources UP-TO-DATE :app:mergeDebugAndroidTestResources UP-TO-DATE :app:processDebugAndroidTestResources UP-TO-DATE :app:generateDebugAndroidTestSources UP-TO-DATE :app:mockableAndroidJar UP-TO-DATE :app:preDebugUnitTestBuild UP-TO-DATE :app:prepareDebugUnitTestDependencies

BUILD SUCCESSFUL

Total time: 18.303 secs `

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