Плагин Android Unity - класс не найден, исключение

Я хочу экспортировать библиотеку Android в Unity, но Android выдает следующую ошибку:

05-14 12:58:10.601 18408-18408/? E/AndroidRuntime: FATAL EXCEPTION: main
                                               Process: com.joostverbraeken.weargame, PID: 18408
                                               java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.joostverbraeken.weargame/com.joostverbraeken.weargame.MainActivity}: java.lang.ClassNotFoundException: Didn't find class "com.joostverbraeken.weargame.MainActivity" on path: DexPathList[[zip file "/data/app/com.joostverbraeken.weargame-1/base.apk"],nativeLibraryDirectories=[/data/app/com.joostverbraeken.weargame-1/lib/arm, /data/app/com.joostverbraeken.weargame-1/base.apk!/lib/armeabi-v7a, /vendor/lib, /system/lib]]
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2332)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2481)
at android.app.ActivityThread.access$900(ActivityThread.java:153)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1349)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5436)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:735)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625)
                                                    Caused by: java.lang.ClassNotFoundException: Didn't find class "com.joostverbraeken.weargame.MainActivity" on path: DexPathList[[zip file "/data/app/com.joostverbraeken.weargame-1/base.apk"],nativeLibraryDirectories=[/data/app/com.joostverbraeken.weargame-1/lib/arm, /data/app/com.joostverbraeken.weargame-1/base.apk!/lib/armeabi-v7a, /vendor/lib, /system/lib]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
at android.app.Instrumentation.newActivity(Instrumentation.java:1068)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2322)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2481) 
at android.app.ActivityThread.access$900(ActivityThread.java:153) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1349) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:148) 
at android.app.ActivityThread.main(ActivityThread.java:5436) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:735) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625) 
                                                    Suppressed: java.lang.NoClassDefFoundError: com.joostverbraeken.weargame.MainActivity
at dalvik.system.DexFile.defineClassNative(Native Method)
at dalvik.system.DexFile.defineClass(DexFile.java:226)
at dalvik.system.DexFile.loadClassBinaryName(DexFile.java:219)
at dalvik.system.DexPathList.findClass(DexPathList.java:338)
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:54)
        ... 13 more
                                                    Suppressed: java.lang.ClassNotFoundException: com.joostverbraeken.weargame.MainActivity
at java.lang.Class.classForName(Native Method)
at java.lang.BootClassLoader.findClass(ClassLoader.java:781)
at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)
at java.lang.ClassLoader.loadClass(ClassLoader.java:504)
        ... 12 more
                                                    Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack trace available

Мой AndroidManifest (я скопировал его из своей библиотеки в Unity) выглядит следующим образом:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.joostverbraeken.weargame">

    <uses-permission android:name="android.permission.WAKE_LOCK" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
    <uses-permission android:name="android.permission.INTERNET"/>
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>

    <application android:icon="@mipmap/ic_launcher" android:label="@string/app_name">
        <activity android:name=".MainActivity"
            android:label="@string/app_name"
            android:configChanges="fontScale|keyboard|keyboardHidden|locale|mnc|mcc|navigation|orientation|screenLayout|screenSize|smallestScreenSize|uiMode|touchscreen">
        <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

Зависимости довольно просты и объявлены в Gradle:

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'], exclude: ['classes.jar'])
    provided files('libs/classes.jar')
    wearApp project(':wear')
    compile 'com.google.android.gms:play-services:8.4.0'
    compile 'com.android.support:support-v4:23.4.0'
}

На форуме я прочитал, что Unity необходимо скопировать зависимости в Assets/Plugins/Android, хотя я использую aar вместо jar. Поэтому я также скопировал support-v4-23.3.0-sources.jar в Assets/Plugins/Android, но play-services-8.4.0.jar не потому, что он не включен в системные файлы Android. play-services-8.4.0.aar включен, но если я скопирую его в Unity, я получу следующую ошибку:

Moving
Temp/StagingArea\android-libraries\play-services-8.4.0\classes.jar to
Temp/StagingArea\android-libraries\play-services-8.4.0\bin\classes.jar:
The system cannot find the file specified.

Кто-нибудь знает, как решить ClassNotFoundException?