Android Gradle plugin 3.0.1 must not be applied to project

Question

I keep getting this error when I try to build my project. I have no idea what is wrong with it and nothing I try is working.

I've trying cleaning, restarting Android Studio, and stopping the daemon with gradlew --stop.

Please help me!

Error:

Android Gradle plugin 3.0.1 must not be applied to project since version 3.0.1 was already applied to this project

Module:app script

apply plugin: 'com.android.application'

android {
    compileSdkVersion 26
    apply plugin: 'com.android.library'

    defaultConfig {
        applicationId "com.example.joey.projectgenesis"
        minSdkVersion 26
        targetSdkVersion 26
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(include: ['*.jar'], dir: 'libs')
    implementation 'com.android.support:appcompat-v7:26.1.0'
    implementation 'com.android.support.constraint:constraint-layout:1.0.2'
    implementation 'com.android.support:design:26.1.0'
    implementation 'com.google.android.gms:play-services-ads:11.8.0'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.1'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'
    implementation 'com.android.support:gridlayout-v7:26.1.0'
}

Project script

    // Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {

    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.0.1'


        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        google()
        jcenter()
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

gradle.wrapper.properties

#Fri Jan 12 20:21:58 EST 2018
distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists
distributionUrl=https\://services.gradle.org/distributions/gradle-4.4.1-all.zip

Answer 1

If you are creating just an app, remove apply plugin: 'com.android.library'.

If you are creating a library replace apply plugin: 'com.android.application' with apply plugin: 'com.android.library' and remove applicationId.

Refer this - Creating Android Libraries