Android - Proguard didn't compile with Joda Time jar file
If the missing classes aren't needed, you can suppress the warnings:
-dontwarn org.joda.convert.**See the ProGuard manual > Troubleshooting > Warning: can't find referenced class
Based on the post here: https://plus.google.com/112998433182673852267/posts/ApBBBjv9szw
What is actually happening is that the missing "FromString" class is an annotation that is not actually present as a class file in joda-time-2.0.jar. There's a claim (http://www.scala-lang.org/node/10575) that a missing annotation class file is not supposed to affect compilation, which sounds correct, but I don't know where this is formally stated.
You'll need to add http://joda-convert.sourceforge.net/ to your project's build path.