我已经在Eclipse中生成了Android项目，并且一切正常。我添加了一些事件按钮。现在，我正在尝试创建Mongo对象，但会引发错误。你有什么解决办法吗？是否可以同时连接这两个？

日志：

07-11 12:40:17.655: E/AndroidRuntime(724): FATAL EXCEPTION: main
07-11 12:40:17.655: E/AndroidRuntime(724): java.lang.IllegalStateException: Could not execute method of the activity
07-11 12:40:17.655: E/AndroidRuntime(724):  at android.view.View$1.onClick(View.java:3591)
07-11 12:40:17.655: E/AndroidRuntime(724):  at android.view.View.performClick(View.java:4084)
07-11 12:40:17.655: E/AndroidRuntime(724):  at android.view.View$PerformClick.run(View.java:16966)
07-11 12:40:17.655: E/AndroidRuntime(724):  at android.os.Handler.handleCallback(Handler.java:615)
07-11 12:40:17.655: E/AndroidRuntime(724):  at android.os.Handler.dispatchMessage(Handler.java:92)
07-11 12:40:17.655: E/AndroidRuntime(724):  at android.os.Looper.loop(Looper.java:137)
07-11 12:40:17.655: E/AndroidRuntime(724):  at android.app.ActivityThread.main(ActivityThread.java:4745)
07-11 12:40:17.655: E/AndroidRuntime(724):  at java.lang.reflect.Method.invokeNative(Native Method)
07-11 12:40:17.655: E/AndroidRuntime(724):  at java.lang.reflect.Method.invoke(Method.java:511)
07-11 12:40:17.655: E/AndroidRuntime(724):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
07-11 12:40:17.655: E/AndroidRuntime(724):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
07-11 12:40:17.655: E/AndroidRuntime(724):  at dalvik.system.NativeStart.main(Native Method)
07-11 12:40:17.655: E/AndroidRuntime(724): Caused by: java.lang.reflect.InvocationTargetException
07-11 12:40:17.655: E/AndroidRuntime(724):  at java.lang.reflect.Method.invokeNative(Native Method)
07-11 12:40:17.655: E/AndroidRuntime(724):  at java.lang.reflect.Method.invoke(Method.java:511)
07-11 12:40:17.655: E/AndroidRuntime(724):  at android.view.View$1.onClick(View.java:3586)
07-11 12:40:17.655: E/AndroidRuntime(724):  ... 11 more
07-11 12:40:17.655: E/AndroidRuntime(724): Caused by: java.lang.NoClassDefFoundError: com.mongodb.DBPortPool
07-11 12:40:17.655: E/AndroidRuntime(724):  at com.mongodb.DBPortPool$Holder.get(DBPortPool.java:58)
07-11 12:40:17.655: E/AndroidRuntime(724):  at com.mongodb.DBTCPConnector.setMasterAddress(DBTCPConnector.java:486)
07-11 12:40:17.655: E/AndroidRuntime(724):  at com.mongodb.DBTCPConnector.<init>(DBTCPConnector.java:46)
07-11 12:40:17.655: E/AndroidRuntime(724):  at com.mongodb.Mongo.<init>(Mongo.java:192)
07-11 12:40:17.655: E/AndroidRuntime(724):  at com.mongodb.Mongo.<init>(Mongo.java:176)
07-11 12:40:17.655: E/AndroidRuntime(724):  at com.mongodb.Mongo.<init>(Mongo.java:130)
07-11 12:40:17.655: E/AndroidRuntime(724):  at com.example.easyrest.MainActivity.clickAddOfferButton_offer(MainActivity.java:66)
07-11 12:40:17.655: E/AndroidRuntime(724):  ... 14 more