title: Gradle Issue Android Studio
body: <p>I am having issues with gradle in my android application.</p>
  
  <pre><code>android {
   compileSdkVersion 27
   defaultConfig {
      applicationId "za.co.gtsolutions.vivachoc"
      minSdkVersion 15
      targetSdkVersion 27
      versionCode 2
      versionName "1.5"
      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.constraint:constraint-layout:1.1.0'
  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.github.bumptech.glide:glide:4.6.1'
  implementation 'com.squareup.okhttp3:okhttp:3.10.0'
  implementation 'com.android.support:design:27.1.1'
   implementation 'com.android.support:appcompat-v7:27.1.1'
   implementation 'com.stripe:stripe-android:6.1.2'
   implementation 'com.google.code.gson:gson:2.8.2'
    annotationProcessor 'com.github.bumptech.glide:compiler:4.6.1'
   implementation 'testfairy:testfairy-android-sdk:1.+@aar'
   testImplementation "org.robolectric:robolectric:3.8"
   implementation 'com.facebook.android:facebook-login:4.32.0'
   android {
      testOptions {
          unitTests {
              includeAndroidResources = true
          }
      }
    }
     compile 'com.android.support:cardview-v7:27.1.1'
     compile 'com.android.support.test.espresso:espresso-contrib:3.0.1'
  </code></pre>
  
  <p>}
  I get the following error: all com.android.support libraries should use the same version and my application will not run because of this. I have changed the minimumSDK Version and targetVersion to apply to the project that i am working on.
  <a href="https://i.stack.imgur.com/hZEC7.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/hZEC7.png" alt="enter image description here"></a>
  I am totaly lost on what the issue could be ?</p>