title: Export wizard error
body: <p>In Eclipse, when I first export my application to an android apk, the process succeeds. If I modify my code and try to re-export the app, I get the error "Conversion to Dalvik format failed with error 1".
  If I clear my project and then launch the export again, the app is correctly built.</p>
  
  <p>What can be the cause of this strange behaviour?</p>
  
  <p>The complete description of the error is below :</p>
  
  <p>Message :
  Export Wizard Error</p>
  
  <pre><code>Exception stack trace :
  org.eclipse.core.runtime.CoreException: Conversion to Dalvik format failed with error 1
      at com.android.ide.eclipse.adt.internal.project.ExportHelper.exportReleaseApk(ExportHelper.java:325)
      at com.android.ide.eclipse.adt.internal.wizards.export.ExportWizard.doExport(ExportWizard.java:305)
      at com.android.ide.eclipse.adt.internal.wizards.export.ExportWizard.access$0(ExportWizard.java:234)
      at com.android.ide.eclipse.adt.internal.wizards.export.ExportWizard$1.run(ExportWizard.java:219)
      at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:121)
  Caused by: com.android.ide.eclipse.adt.internal.build.DexException: Conversion to Dalvik format failed with error 1
      at com.android.ide.eclipse.adt.internal.build.BuildHelper.executeDx(BuildHelper.java:792)
      at com.android.ide.eclipse.adt.internal.project.ExportHelper.exportReleaseApk(ExportHelper.java:282)
      ... 4 more
  </code></pre>
  
  <p>Session data :</p>
  
  <pre><code>eclipse.buildId=4.3.0.M20130911-1000
  java.version=1.7.0_17
  java.vendor=Oracle Corporation
  BootLoader constants: OS=win32, ARCH=x86_64, WS=win32, NL=fr_FR
  Framework arguments:  -product org.eclipse.epp.package.jee.product
  Command-line arguments:  -os win32 -ws win32 -arch x86_64 -product org.eclipse.epp.package.jee.product
  </code></pre>