How to Fix ‘App Not Installed’ Error on Android Mobile

Hi,

I'M facing a problem "App Not Installed" in Android Phone.

Some Time App install easly and if install twice then showing Error "App Not Installed"

Maximum time showing Above error .

my App manifest :

android:name="android.permission.READ_EXTERNAL_STORAGE"

android:maxSdkVersion="18" />

Project Gradle :

buildscript {

repositories {

jcenter()

google()

}

dependencies {

classpath 'com.android.tools.build:gradle:3.0.0-beta6'

classpath 'com.google.gms:google-services:3.1.0'

}

allprojects {

repositories {

jcenter()

google()

}

APP Gradle :

android {

compileSdkVersion 22

buildToolsVersion '26.0.2'

defaultConfig {

applicationId "com.example.awadhesh.edl"

minSdkVersion 14

targetSdkVersion 22

versionCode 6

versionName '1.6'

}

buildTypes {

release {

minifyEnabled false

proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'

}

productFlavors {

}

dependencies {

implementation 'com.google.firebase:firebase-core:11.0.4'

implementation 'com.google.firebase:firebase-messaging:11.0.4'

implementation 'com.google.android.gms:play-services-maps:11.0.4'

compile fileTree(include: ['*.jar'], dir: 'libs')

compile 'com.android.support:appcompat-v7:22.2.1'

compile files('src/main/res/PRT_SDK.jar')

compile files('src/main/res/ksoap2-android-assembly-3.1.1-jar-with-dependencies.jar')

compile 'com.android.support.constraint:constraint-layout:1.0.2'

implementation files('libs/org.apache.commons.io.jar')

}

apply plugin: 'com.google.gms.google-services'

Please Help ....