Had same problem after upgrade to Eclipse Indigo. The whole errors list started with
[dx] java.lang.IllegalArgumentException: already added: ;
and ended with
Conversion to Dalvik format failed with error 1
The solution:
- Right-click on project and select "Properties"
- Select "Java Build Path" on left tree
- Select "Library" tab on top
- You will, probably see this library in the list (it is not jar, but
Library!, the jar is below)
- Delete it.
