Question

here is my error :

UNEXPECTED TOP-LEVEL EXCEPTION:
java.lang.IllegalArgumentException: already added: Lorg/codehaus/jackson/Base64Variant;
Conversion to Dalvik format failed with error 1

Well, 5 minutes ago it worked. Didn’t change anything (only started the android emulator again) – so what’s going on now?

Thanks guys.

Answer 1

Your toolchain is calling dx with multiple copies of the Jackson JSON parser. You’ll want to make sure your project libraries don’t include two copies of Jackson. You can see if an individual jar file contains Jackson with jar and grep:

jar tvf lib/some-library.jar | grep jackson