Unable to execute dex: Multiple dex files define Lcom/myapp/R$array;

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I had the same problem, quite weird because it was happening only when using Eclipse (but it was OK with Ant).
This is how I fixed it:

  • Right click on the Project Name
  • Select Build Path -> Configure Build Path

  • In Java Build Path, go to the tab Order and Export

  • Uncheck your .jar library

Only sometimes:
In Order and Export tab I did not have any jar library there, so I have unchecked Android Private Libraries item. Now my project is running.

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