This seems like a binding problem.
You must make sure that your jar file is correctly copied to the /lib
directory of your project AND added to the build path.
If you are using Eclipse / ADT, you must upgrade to the latest version (Juno, released June 24, 2014, while I am writing this). It automatically binds to the binding when the jar files are under / lib.
If your application is confused, this could also be a ProGuard problem. In this case, please let me know, there is already an SO question there regarding this.
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