title: Execution failed for task ':app:minifyReleaseWithR8'
body: <pre><code>    &gt; Task :app:minifyReleaseWithR8
  AGPBI: {"kind":"warning","text":"Ignoring option: -dump","sources":[{"file":"/Users/merlin720/easycan/gitlab/android-app/app/proguard-rules.pro","position":{"startLine":47,"startColumn":0,"startOffset":1295,"endColumn":21,"endOffset":1316}}],"tool":"R8"}
  AGPBI: {"kind":"warning","text":"Missing class: com.alipay.sdk.app.H5PayCallback","sources":[{}],"tool":"R8"}
  AGPBI: {"kind":"warning","text":"Missing class: com.facebook.imagepipeline.request.BasePostprocessor","sources":[{}],"tool":"R8"}
  AGPBI: {"kind":"warning","text":"Missing class: com.bun.miitmdid.core.IIdentifierListener","sources":[{}],"tool":"R8"}
  AGPBI: {"kind":"warning","text":"Library class android.test.AndroidTestRunner extends program class junit.runner.BaseTestRunner","sources":[{}],"tool":"R8"}
  AGPBI: {"kind":"warning","text":"Library class android.test.InstrumentationTestCase extends program class junit.framework.TestCase","sources":[{}],"tool":"R8"}
  AGPBI: {"kind":"warning","text":"Library class android.test.AndroidTestCase extends program class junit.framework.TestCase","sources":[{}],"tool":"R8"}
  AGPBI: {"kind":"warning","text":"Library class android.test.InstrumentationTestSuite extends program class junit.framework.TestSuite","sources":[{}],"tool":"R8"}
  </code></pre>
  
  <blockquote>
    <p>Task :app:minifyReleaseWithR8 FAILED</p>
  </blockquote>
  
  <p>FAILURE: Build failed with an exception.</p>
  
  <ul>
  <li>What went wrong:
  Execution failed for task ':app:minifyReleaseWithR8'.
  
  <blockquote>
    <p>java.lang.NullPointerException (no error message)</p>
  </blockquote></li>
  </ul>
  
  <p>when i update android studio to 3.0 and </p>
  
  <pre><code>dependencies {
      classpath 'com.android.tools.build:gradle:3.6.0'
      classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
      // NOTE: Do not place your application dependencies here; they belong
      // in the individual module build.gradle files
  
      //美团多渠道
      classpath 'com.meituan.android.walle:plugin:1.1.6'
  }
  </code></pre>
  
  <p>distributionUrl=https://services.gradle.org/distributions/gradle-5.6.4-all.zip</p>