title: Flutter build failed for task ':app:mergeDebugResources'
body: <p>At the moment I'm learning Flutter.</p>
  <p>Today I ran into this error:</p>
  <pre><code>FAILURE: Build failed with an exception.
  
  * What went wrong:
  Execution failed for task ':app:mergeDebugResources'.
  &gt; A failure occurred while executing com.android.build.gradle.internal.tasks.Workers$ActionFacade
     &gt; Android resource compilation failed
       C:\Users\USERNAME\Documents\Flutter\my-app\android\app\src\main\res\values\colors.xml:3:5-78: AAPT: error: invalid color.
  
       C:\Users\USERNAME\Documents\Flutter\my-app\build\app\intermediates\incremental\mergeDebugResources\merged.dir\values\values.xml: AAPT: error: file failed to compile.
  
  
  * Try:
  Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.
  
  * Get more help at https://help.gradle.org
  
  BUILD FAILED in 23s
  </code></pre>
  <p>After searching for hours I already tried:</p>
  <ul>
  <li>Other gradle versions</li>
  <li>Other launcher_icon</li>
  <li>with or without settings_aar.gradle</li>
  </ul>
  <p>At the same time this error occurred I also had a new file in the <code>android</code> folder called <code>settings_aar.gradle</code>. I don't know if this has any relation to the error above or if it's something else.</p>
  <p>The <code>colors.xml</code> mentioned in the error above looks like this:</p>
  <pre><code>&lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;
  &lt;resources&gt;
      &lt;color name=&quot;ic_launcher_background&quot;&gt;lib/assets/launcher/logo.png&lt;/color&gt;
  &lt;/resources&gt;
  </code></pre>
  <p>After the error, flutter continues with building the packages I guess. The first few do succeed until a second error occurrs:</p>
  <pre><code>FAILURE: Build failed with an exception.
  
  * What went wrong:
  Could not determine the dependencies of task ':app:compileDebugJavaWithJavac'.
  &gt; Could not resolve all task dependencies for configuration ':app:debugCompileClasspath'.
     &gt; Could not resolve com.github.droibit.customtabslauncher:launcher:1.4.0.
       Required by:
           project :app &gt; com.github.droibit.plugins.flutter.customtabs:flutter_custom_tabs_release:1.0
        &gt; Could not resolve com.github.droibit.customtabslauncher:launcher:1.4.0.
           &gt; Could not get resource 'https://jcenter.bintray.com/com/github/droibit/customtabslauncher/launcher/1.4.0/launcher-1.4.0.pom'.
              &gt; Could not HEAD 'https://repo.jfrog.org/artifactory/libs-release-bintray/com/github/droibit/customtabslauncher/launcher/1.4.0/launcher-1.4.0.pom?referrer'.
                 &gt; sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
  
  * Try:
  Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.
  
  * Get more help at https://help.gradle.org
  
  BUILD FAILED in 9s
  </code></pre>
  <p>Again I have no idea if these two errors belong together.</p>
  <p>My actual flutter version where I'm trying this is <code>1.17.5</code>
  <code>flutter doctor -v</code> looks like this:</p>
  <pre><code>[√] Flutter (Channel unknown, v1.17.5, on Microsoft Windows [Version 10.0.18363.900], locale de-CH)
      • Flutter version 1.17.5 at C:\Users\USERNAME\flutter
      • Framework revision 8af6b2f038 (5 weeks ago), 2020-06-30 12:53:55 -0700
      • Engine revision ee76268252
      • Dart version 2.8.4
  
  
  [√] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
      • Android SDK at C:\Users\USERNAME\sdk
      • Platform android-29, build-tools 29.0.2
      • ANDROID_HOME = C:\Users\USERNAME\sdk
      • ANDROID_SDK_ROOT = C:\Users\USERNAME\sdk
      • Java binary at: C:\Program Files\Android\Android Studio\jre\bin\java
      • Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b03)
      • All Android licenses accepted.
  
  [√] Android Studio (version 3.5)
      • Android Studio at C:\Program Files\Android\Android Studio
      • Flutter plugin version 42.1.1
      • Dart plugin version 191.8593
      • Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b03)
  
  [!] IntelliJ IDEA Ultimate Edition (version 2019.1)
      • IntelliJ at C:\Program Files\JetBrains\IntelliJ IDEA 2019.1.3
      X Flutter plugin not installed; this adds Flutter specific functionality.
      X Dart plugin not installed; this adds Dart specific functionality.
      • For information about installing plugins, see
        https://flutter.dev/intellij-setup/#installing-the-plugins
  
  [√] VS Code (version 1.47.3)
      • VS Code at C:\Users\USERNAME\AppData\Local\Programs\Microsoft VS Code
      • Flutter extension version 3.13.1
  
  [√] Connected device (1 available)
      • AOSP on IA Emulator • emulator-5554 • android-x86 • Android 9 (API 28) (emulator)
  </code></pre>
  <p>And this is my pubspec.yaml:</p>
  <pre><code>name: MyApp
  description: Some description
  
  publish_to: 'none' # Remove this line if you wish to publish to pub.dev
  
  version: 1.0.0+1
  
  environment:
    sdk: &quot;&gt;=2.7.0 &lt;3.0.0&quot;
  
  dependencies:
    flutter:
      sdk: flutter
    
    
    cupertino_icons: ^0.1.3
    http: ^0.12.2
    flutter_html_view: ^0.5.12
    url_launcher: ^5.5.0
    flutter_slidable: ^0.5.5
    add_2_calendar: ^1.4.0
    flutter_launcher_icons: ^0.7.5
    onesignal_flutter: ^2.6.0
    flutter_staggered_grid_view: ^0.3.2
    
  dev_dependencies:
    flutter_test:
      sdk: flutter
  
  flutter:
    uses-material-design: true
    assets:
      - lib/assets/logo.jpg
      - lib/assets/logo.png
  
  
  flutter_icons:
    ios: true
    android: true
    image_path_ios: &quot;lib/assets/launcher/logo.jpg&quot;
    image_path_android: &quot;lib/assets/launcher/logo.png&quot;
    adaptive_icon_background: &quot;lib/assets/launcher/logo.png&quot;
    adaptive_icon_foreground: &quot;lib/assets/launcher/logo.png&quot;
  </code></pre>
  <p>I know it's a pretty long question but I wanted to provide anything important. If anything else is required please tell me.</p>
  <p>Thank you very much...</p>