我试图完成我的应用程序发布在Google Play商店，以便上传到alpha测试阶段.当试图启动应用程序，它立即关闭，这是我收到的错误：

java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.FinalFrontier.MoonLanding/com.FinalFrontier.MoonLanding.MainActivity}: java.lang.ClassNotFoundException: Didn't find class "com.FinalFrontier.MoonLanding.MainActivity" on path: DexPathList[[zip file "/data/app/com.FinalFrontier.MoonLanding-1.apk"],nativeLibraryDirectories=[/data/app-lib/com.FinalFrontier.MoonLanding-1, /vendor/lib, /system/lib]]
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2192)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2316)
at android.app.ActivityThread.access$600(ActivityThread.java:150)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1298)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:213)
at android.app.ActivityThread.main(ActivityThread.java:5225)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:741)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:557)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.ClassNotFoundException: Didn't find class "com.FinalFrontier.MoonLanding.MainActivity" on path: DexPathList[[zip file "/data/app/com.FinalFrontier.MoonLanding-1.apk"],nativeLibraryDirectories=[/data/app-lib/com.FinalFrontier.MoonLanding-1, /vendor/lib, /system/lib]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:53)
at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
at android.app.Instrumentation.newActivity(Instrumentation.java:1061)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2183)
... 11 more

这是我的第一个应用程序，我很新，所以任何帮助都将不胜感激。我已经阅读了文档，并在网上搜索了错误，但似乎无法得到任何解决方案。这里是我的android清单的副本。

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" android:versionCode="2" android:versionName="1.1" package="com.FinalFrontier.MoonLanding" android:installLocation="preferExternal">
<application android:icon="@drawable/app_icon" android:label="@String/app_name" android:debuggable="false" android:isGame="true" android:banner="@drawable/app_banner">
<activity android:configChanges="fontScale|keyboard|keyboardHidden|locale|mnc|mcc|navigation|orientation|screenLayout|screenSize|smallestScreenSize|uiMode|touchscreen" android:label="@String/app_name" android:name="com.FinalFrontier.MoonLanding.CustomActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
<category android:name="android.intent.category.LEANBACK_LAUNCHER" />
</intent-filter>
</activity>
<activity android:configChanges="fontScale|keyboard|keyboardHidden|locale|mnc|mcc|navigation|orientation|screenLayout|screenSize|smallestScreenSize|uiMode|touchscreen" android:hardwareAccelerated="true" android:name="com.unity3d.ads.android.view.UnityAdsFullscreenActivity" android:theme="@android:style/Theme.NoTitleBar.Fullscreen" xmlns:tools="http://schemas.android.com/tools" tools:ignore="UnusedAttribute" />
</application>
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="com.android.vending.BILLING" />
<uses-sdk android:minSdkVersion="9" android:targetSdkVersion="23" />
<uses-feature android:glEsVersion="0x00020000" />
<uses-feature android:name="android.hardware.sensor.accelerometer" android:required="false" />
<uses-feature android:name="android.hardware.touchscreen" android:required="false" />
<uses-feature android:name="android.hardware.touchscreen.multitouch" android:required="false" />
<uses-feature android:name="android.hardware.touchscreen.multitouch.distinct" android:required="false" />
</manifest>

有人有什么主意吗？先谢谢你了。