Dx bad class file magic (cafebabe) or version (0033.0000) with ADK14

Question

Since moving to ADK14, I have been unable to build new apks for release on my Windows 7 system.

Building fails with \"conversion to dalvik format failed with error 1

Answer 1

i tried everything from the several other solutions. that thing that helped me was to download the most current version of ProGuard and copy it do android-sdk/tools/proguard/bin and lib.