Android: Solution for "proguard returned with error code 1" and “Conversion to Dalvik format failed with error 1"

ProGuard is a free Java class file shrinker, optimizer, obfuscator, and preverifier. It detects and removes unused classes, fields, methods, and attributes. It optimizes bytecode and removes unused instructions. It renames the remaining classes, fields, and methods using short meaningless names. Finally, it preverifies the processed code for Java 6 or for Java Micro Edition.

Solution for few errors like “Proguard returned with error code 1.”  and “Conversion to Dalvik format failed with error 1” is to download from http://sourceforge.net/projects/proguard/files/proguard/  and just copy the ProGuard jars to android-sdk/tools/proguard/lib

Conversion to Dalvik format failed with error 1

This error may have various causes, but if dx is tripping over some code processed by ProGuard, you should make sure that you are using the latest version of ProGuard. You can just copy the ProGuard jars to android-sdk/tools/proguard/lib.

For more details refer: Troubleshooting Link

Note: Check jar file paths are mapped properly in the proguard.cfg file.