title: fix the error : Plugin with id 'com.android.application' not found
body: <p>When I create a new project in android studio, at first every thing is o.k and it runs on my mobile phone. But if I press the sync button then a terrible error(which I afraid of and hate it) is appeared: "Plugin with id 'com.android.application' not found". I search and read all answers related to this error and do every thing. But my problem is also remained.
  Here is my build.gradle(module.app):</p>
  
  <pre><code>apply plugin: 'com.android.application'
  
  android {
       compileSdkVersion 27
       defaultConfig {
           applicationId "com.example.masood.pietest"
           minSdkVersion 16
           targetSdkVersion 27
           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(dir: 'libs', include: ['*.jar'])
  implementation 'com.android.support:appcompat-v7:27.1.0'
  implementation 'com.android.support.constraint:constraint-layout:1.0.2'
  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'
  }
  </code></pre>
  
  <p>and here is my build.gradle(project):</p>
  
  <pre><code>buildscript {
  
      repositories {
          google()
          jcenter()
      }
      dependencies {
          classpath 'com.android.tools.build:gradle:3.1.0-alpha09'
  
  
          // 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
  }
  </code></pre>
  
  <p>Really, I don't know what I need to do...
  Could anyone help me?</p>