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I'm developing and android application using Google Maps. Everything was fine until I used Google Maps Android API Utility.

I followed the instructions in

https://developers.google.com/maps/documentation/android/utility/setup

to install and use the library in my application, but when i try to launch it I get a NoClassDefFoundErrorat runtime

Then I followed the instructions in

couldn't run Google Maps Android API Utility Demo

but now the application doesn't start at all, when I try to launch it I get a prompt with the following message

"Your project contains errors, please fix them before running your application"

and on the log I have 

Unable to execute dex: Multiple dex files define Lcom/google/android/gms/R$attr;
Conversion to Dalvik format failed: Unable to execute dex: Multiple dex files define Lcom/google/android/gms/R$attr;

what should I do to solve this issue? Thanks

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  • This is something to do with Java Build Path -> Order and Export tab. Try unselecting all the dependencies from Project-> Properties-> Java Build Path-> Order and Export and clean build your project. – rizzz86 Feb 17 '15 at 16:23
  • Just to add to the comment of @rizzz86, the only answer in [this](http://stackoverflow.com/questions/17032157/is-there-a-way-to-get-the-dex-loader-in-android-to-allow-multiple-of-a-class) post solves the exact same error you are having. However, I am not sure if it will solve the NoClassDefFoundError that you had. Can you paste the logs that print this error if they reoccur? – Koh Feb 17 '15 at 17:33

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