title: How to fix "Execution failed for task ':app:processDebugResources'. > Android resource linking failed"[Android/Flutter]
body: <p>It happened out of nowhere. One day I was running my code which was working just fine, and the next day, without touching my build.gradle files or any other build files this error popped up.</p>
  
  <p>I have tried a lot of different solutions like changing my buildToolsVersion or setting a specific flag of AAPT(can't remember which) to false. Nothing works.
  My app\build.gradle file:</p>
  
  <pre><code> android {
   compileSdkVersion 27
   buildToolsVersion '27.0.3'
  
   sourceSets {
       main.java.srcDirs += 'src/main/kotlin'
   } 
  
   lintOptions {
       disable 'InvalidPackage'
   }
  
   defaultConfig {
       // TODO: Specify your own unique Application ID 
       (https://developer.android.com/studio/build/application-id.html).
       applicationId "com.skydevs.bookx"
       minSdkVersion 16
       targetSdkVersion 27
       versionCode flutterVersionCode.toInteger()
       versionName flutterVersionName
       testInstrumentationRunner 
       "android.support.test.runner.AndroidJUnitRunner"
   }
  
   buildTypes {
       release {
           // TODO: Add your own signing config for the release build.
           // Signing with the debug keys for now, so `flutter run --release` 
           works.
           signingConfig signingConfigs.debug
       }
   }
   }
  
   flutter {
       source '../..'
   }
  
   dependencies {
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
     testImplementation 'junit:junit:4.12'
     androidTestImplementation 'com.android.support.test:runner:1.0.2'
     androidTestImplementation 'com.android.support.test.espresso:espresso- 
     core:3.0.2'
     implementation 'com.google.firebase:firebase-core:16.0.1'
   }
  
   apply plugin: 'com.google.gms.google-services'
  </code></pre>
  
  <p>The error I'm getting is:</p>
  
  <pre><code>Execution failed for task ':app:processDebugResources'.
  &gt; Android resource linking failed
    Output:  C:\Users\baada\AndroidStudioProjects\bookx\build\app\intermediates\incremental\mergeDebugResources\merged.dir\values-v28\values-v28.xml:7: error: resource android:attr/dialogCornerRadius not found.
    C:\Users\baada\AndroidStudioProjects\bookx\build\app\intermediates\incremental\mergeDebugResources\merged.dir\values-v28\values-v28.xml:11: error: resource android:attr/dialogCornerRadius not found.
    C:\Users\baada\AndroidStudioProjects\bookx\build\app\intermediates\incremental\mergeDebugResources\merged.dir\values\values.xml:905: error: resource android:attr/fontVariationSettings not found.
    C:\Users\baada\AndroidStudioProjects\bookx\build\app\intermediates\incremental\mergeDebugResources\merged.dir\values\values.xml:905: error: resource android:attr/ttcIndex not found.
    error: failed linking references.
  
    Command: C:\Users\baada\.gradle\caches\transforms-1\files-1.1\aapt2-3.2.1-4818971-windows.jar\a5cc63922d025d4315a498efa486650c\aapt2-3.2.1-4818971-windows\aapt2.exe link -I\
            C:\Users\baada\AppData\Local\Android\sdk\platforms\android-27\android.jar\
            --manifest\
            C:\Users\baada\AndroidStudioProjects\bookx\build\app\intermediates\merged_manifests\debug\processDebugManifest\merged\AndroidManifest.xml\
            -o\
            C:\Users\baada\AndroidStudioProjects\bookx\build\app\intermediates\processed_res\debug\processDebugResources\out\resources-debug.ap_\
            -R\
            @C:\Users\baada\AndroidStudioProjects\bookx\build\app\intermediates\incremental\processDebugResources\resources-list-for-resources-debug.ap_.txt\
            --auto-add-overlay\
            --java\
            C:\Users\baada\AndroidStudioProjects\bookx\build\app\generated\not_namespaced_r_class_sources\debug\processDebugResources\r\
            --custom-package\
            com.example.bookx\
            -0\
            apk\
            --output-text-symbols\
            C:\Users\baada\AndroidStudioProjects\bookx\build\app\intermediates\symbols\debug\R.txt\
            --no-version-vectors
    Daemon:  AAPT2 aapt2-3.2.1-4818971-windows Daemon #0
    Output:  C:\Users\baada\.gradle\caches\transforms-1\files-1.1\appcompat-1.0.2.aar\aa44270b14856bd5a0b17a3c0a45cb34\res\values-v28\values-v28.xml:9:5-12:13: AAPT: error: resource android:attr/dialogCornerRadius not found.
  
    C:\Users\baada\AndroidStudioProjects\bookx\build\app\intermediates\incremental\mergeDebugResources\merged.dir\values-v28\values-v28.xml:11: AAPT: error: resource android:attr/dialogCornerRadius not found.
  
    C:\Users\baada\.gradle\caches\transforms-1\files-1.1\core-1.0.1.aar\bc8b94f938baa5558925fd51b49cb6bf\res\values\values.xml:89:5-125:25: AAPT: error: resource android:attr/fontVariationSettings not found.
  
    C:\Users\baada\.gradle\caches\transforms-1\files-1.1\core-1.0.1.aar\bc8b94f938baa5558925fd51b49cb6bf\res\values\values.xml:89:5-125:25: AAPT: error: resource android:attr/ttcIndex not found.
  
    error: failed linking references.
    Command: C:\Users\baada\.gradle\caches\transforms-1\files-1.1\aapt2-3.2.1-4818971-windows.jar\a5cc63922d025d4315a498efa486650c\aapt2-3.2.1-4818971-windows\aapt2.exe link -I\
            C:\Users\baada\AppData\Local\Android\sdk\platforms\android-27\android.jar\
            --manifest\
            C:\Users\baada\AndroidStudioProjects\bookx\build\app\intermediates\merged_manifests\debug\processDebugManifest\merged\AndroidManifest.xml\
            -o\
            C:\Users\baada\AndroidStudioProjects\bookx\build\app\intermediates\processed_res\debug\processDebugResources\out\resources-debug.ap_\
            -R\
            @C:\Users\baada\AndroidStudioProjects\bookx\build\app\intermediates\incremental\processDebugResources\resources-list-for-resources-debug.ap_.txt\
            --auto-add-overlay\
            --java\
            C:\Users\baada\AndroidStudioProjects\bookx\build\app\generated\not_namespaced_r_class_sources\debug\processDebugResources\r\
            --custom-package\
            com.example.bookx\
            -0\
            apk\
            --output-text-symbols\
            C:\Users\baada\AndroidStudioProjects\bookx\build\app\intermediates\symbols\debug\R.txt\
            --no-version-vectors
    Daemon:  AAPT2 aapt2-3.2.1-4818971-windows Daemon #0
  </code></pre>