I'm in trouble since yesterday. In my internship I faced the following build error, but I couldn't understand why :

```
$ cordova build android

[...]

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':transformClassesWithDexForDebug'.
> 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;

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

BUILD FAILED

Total time: 3.379 secs
Error: /home/thor/Projects/App_CDP/platforms/android/gradlew: Command failed with exit code 1 Error output:
Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: Some input files use unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':transformClassesWithDexForDebug'.
> 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;

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

```

Here is the output of `cordova plugins list`, I don't have the support-v4/v13 conflict as you can see :

```
$ cordova plugin list
com.googlemaps.ios 2.2.0-fixed "Google Maps SDK for iOS"
com.moust.cordova.videoplayer 1.0.1 "Video Player"
cordova-plugin-camera 2.4.1 "Camera"
cordova-plugin-compat 1.1.0 "Compat"
cordova-plugin-console 1.0.5 "Console"
cordova-plugin-device 1.1.4 "Device"
cordova-plugin-facebook4 1.9.1 "Facebook Connect"
cordova-plugin-file 4.0.0 "File"
cordova-plugin-file-transfer 1.6.3 "File Transfer"
cordova-plugin-geolocation 2.4.3 "Geolocation"
cordova-plugin-googlemaps 1.4.0 "phonegap-googlemaps-plugin"
cordova-plugin-inappbrowser 1.7.1 "InAppBrowser"
cordova-plugin-splashscreen 4.0.3 "Splashscreen"
cordova-plugin-statusbar 2.2.2 "StatusBar"
cordova-plugin-whitelist 1.3.1 "Whitelist"
ionic-plugin-keyboard 2.2.1 "Keyboard"
{}

```

Here are also some more informations:

```
$ cordova -v
7.0.1

$ ionic -v
2.1.4

```