Eclipse/Java/Android Unable to execute dex: Multiple dex files define

Question

[2013-10-05 15:41:30 - Dex Loader] Unable to execute dex: Multiple dex files define Lmyjava/awt/datatransfer/DataFlavor;
[2013-10-05 15:41:30 - KoldRainApplicationsSeries] Conversion to Dalvik format failed: Unable to execute dex: Multiple dex files define Lmyjava/awt/datatransfer/DataFlavor;

I know this is a build path issue, but I dont know whats wrong with my build path, so here is a screenshot of it

Answer 1

Since last Android versions you're not supposed to add libraries from the build path, but just copy&paste them into libs folder.

Remove external jars ( activation.jar , additional.jar and mail.jar ) from your Build path , and add them to libs folder (you may create the folder if it doesn't exist).