ClassCastException while dynamically loading a class in Android

I have a thread that loads different classes for the resources it needs depending on the specific implementation of the system. My implementation is on Android and I have a class that returns the specific classes needed by my implementation. I seem to be able to load the class fine, but when I try to assign it to the object in my main thread, it gives me a ClassCastException. Here are the snippets:

In my main thread, I do:

    try {
        grammarProcessor = config.loadObject(GrammarProcessor.class);

which gives me this stacktrace:

    E/AndroidRuntime(6682): FATAL EXCEPTION: JVoiceXmlMain
    E/AndroidRuntime(6682): java.lang.ClassCastException: org.jvoicexml.android.JVoiceXmlGrammarProcessor
    E/AndroidRuntime(6682):     at org.jvoicexml.JVoiceXmlMain.run(JVoiceXmlMain.java:321)

GrammarProcessor is an interface and JVoiceXmlGrammarProcessor is the class that I load and implements that interface. The loading code is as follows:

else if(baseClass == GrammarProcessor.class){
        String packageName = "org.jvoicexml.android";
        String className = "org.jvoicexml.android.JVoiceXmlGrammarProcessor";           
        String apkName = null;
        Class<?> handler = null;
        T b = null;

        try {
            PackageManager manager = callManagerContext.getPackageManager();
            ApplicationInfo info= manager.getApplicationInfo(packageName, 0);
            apkName= info.sourceDir;
        } catch (NameNotFoundException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
            return null;
        }
        PathClassLoader myClassLoader =
            new dalvik.system.PathClassLoader(
                    apkName,
                    ClassLoader.getSystemClassLoader());
        try {
            handler = Class.forName(className, true, myClassLoader);
            return (T) handler