Execution failed for task ':app:transformClassesWithJarMergingForDebug' in android volley libraries

I’ve read article http://support.backendless.com/t/execution-failed-with-backendless-please-solve-this-problem-quick#comment-12955 . But there isn’t any help for me. I searched everywhere but there isn’t any solution.The error is bellow

Error:Execution failed for task ‘:app: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 Lcom/android/volley/VolleyError;

This error will disappear when removing compile ‘com.mcxiaoke.volley:library:1.0.18’ in build.gradle . But after that, the JSON doesn’t flow same as before done. What would be I missed ?

Hello,

Perhaps you should contact the author of the volley library? This is a technical support forum for Backendless and it appears the problem is not related to our software.

Regards,
Mark