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android/app/build.gradle

@@ -27,6 +27,10 @@ apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 android {
     compileSdkVersion 28
 
+    packagingOptions {
+        exclude 'META-INF/proguard/androidx-annotations.pro'
+    }
+
     lintOptions {
         disable 'InvalidPackage'
     }