Java Android Studio libGDX Api 16崩溃

Question

如果我使用API 16的手机，我的应用程序就会崩溃，但使用API 22则完全可以。以下是API 16的错误代码：

09-15 20:31:26.806  17349-17349/? E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.NoClassDefFoundError: src.bestScore
        at src.MainClass.<init>(MainClass.java:119)
        at src.AndroidLauncher.onCreate(AndroidLauncher.java:28)
        at 安卓.app.Activity.performCreate(Activity.java:5185)
        at 安卓.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1094)
        at 安卓.app.ActivityThread.performLaunchActivity(ActivityThread.java:2071)
        at 安卓.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2132)
        at 安卓.app.ActivityThread.access$700(ActivityThread.java:140)
        at 安卓.app.ActivityThread$H.handleMessage(ActivityThread.java:1238)
        at 安卓.os.Handler.dispatchMessage(Handler.java:99)
        at 安卓.os.Looper.loop(Looper.java:137)
        at 安卓.app.ActivityThread.main(ActivityThread.java:4918)
        at java.lang.reflect.Method.invokeNative(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:511)
        at com.安卓.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:994)
        at com.安卓.internal.os.ZygoteInit.main(ZygoteInit.java:761)
        at dalvik.system.NativeStart.main(Native Method)