“Conversion to Dalvik format failed with error 1” on external JAR

Question

In my Android application in Eclipse I get the following error.

UNEXPECTED TOP-LEVEL EXCEPTION:
java.lang.IllegalArgumentException: already add

Answer 1

I solved the problem.

This is a JAR file conflict.

It seems that I have two JAR files on my buildpath that include the same package and classes.

smack.jar and android_maps_lib-1.0.2

Deleting this package from one of the JAR files solved the problem.