Error when build android

Ionic Framework ionic-v3
1

hello
i got this error
when build android

   * What went wrong:
    Execution failed for task ':transformClassesWithDexForArmv7Release'.
    > com.android.build.api.transform.TransformException:
    com.android.ide.common.process.ProcessException: java.util.concurrent.ExecutionException:
    com.android.dex.DexException: Multiple dex files define Lorg/apache/cordova/BuildHelper;
2

I had this problem the other day. It related to conflicting plugins for me. I can’t remember the exact steps I took to solve, but I know I did something along the lines of checking all my plugins and then removing and re-adding the android platform.

Actually now that I’m thinking about it, check and see if the cordova-plugin-compat is installed. There are lots of posts around about how this plugin now conflicts with the latest version of cordova. Check around the forums, and I even believe there is a pinned support piece on the topic.