[Nexus 5 Android Development] UnknownzD:
Crash log for your application under ART environment:

I/ActivityManager( 766): START u0 {act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10200000 cmp=com.android.camera2/com.android.camera.CameraLauncher} from pid 1132
D/audio_hw_primary( 200): select_devices: out_snd_device(2: speaker) in_snd_device(0: )
W/art ( 198): Could not get current activity
I/ActivityManager( 766): Start proc com.android.camera2 for activity com.android.camera2/com.android.camera.CameraLauncher: pid=3246 uid=10101 gids={50101, 3003, 1028, 1015}
W/art ( 3246): Failed to find ELF magic in /system/framework/com.google.android.media.effects.odex: dey
W/art ( 3246): Failed to find ELF magic in /system/framework/com.google.android.camera2.odex: dey
I/art ( 3246): Failed to open oat file from /system/app/GoogleCamera.odex or /data/dalvik-cache/system@app@GoogleCamera.apk@classes.dex.
E/art ( 3246): Failed to open file: /data/dalvik-cache/system@app@GoogleCamera.apk@classes.dex
E/art ( 3246): Failed to open locked oat file: /data/dalvik-cache/system@app@GoogleCamera.apk@classes.dex
W/art ( 3246): Failed to open dex file: /system/app/GoogleCamera.apk
D/AndroidRuntime( 3246): Shutting down VM
E/AndroidRuntime( 3246): FATAL EXCEPTION: main
E/AndroidRuntime( 3246): Process: com.android.camera2, PID: 3246
E/AndroidRuntime( 3246): java.lang.RuntimeException: Unable to instantiate application com.android.camera.app.CameraApp: java.lang.ClassNotFoundException: Didn't find class "com.android.camera.app.CameraApp" on path: DexPathList[[zip file "/system/framework/com.google.android.media.effects.jar", zip file "/system/framework/com.google.android.camera2.jar", zip file "/system/app/GoogleCamera.apk"],nativeLibraryDirectories=[/vendor/lib, /system/lib]]
E/AndroidRuntime( 3246): at android.app.LoadedApk.makeApplication(LoadedApk.java:516)
E/AndroidRuntime( 3246): at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4317)
E/AndroidRuntime( 3246): at android.app.ActivityThread.access$1500(ActivityThread.java:135)
E/AndroidRuntime( 3246): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
E/AndroidRuntime( 3246): at android.os.Handler.dispatchMessage(Handler.java:102)
E/AndroidRuntime( 3246): at android.os.Looper.loop(Looper.java:136)
E/AndroidRuntime( 3246): at android.app.ActivityThread.main(ActivityThread.java:5017)
E/AndroidRuntime( 3246): at java.lang.reflect.Method.invoke(Native Method)
E/AndroidRuntime( 3246): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
E/AndroidRuntime( 3246): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
E/AndroidRuntime( 3246): Caused by: java.lang.ClassNotFoundException: Didn't find class "com.android.camera.app.CameraApp" on path: DexPathList[[zip file "/system/framework/com.google.android.media.effects.jar", zip file "/system/framework/com.google.android.camera2.jar", zip file "/system/app/GoogleCamera.apk"],nativeLibraryDirectories=[/vendor/lib, /system/lib]]
E/AndroidRuntime( 3246): at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
E/AndroidRuntime( 3246): at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
E/AndroidRuntime( 3246): at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
E/AndroidRuntime( 3246): at android.app.Instrumentation.newApplication(Instrumentation.java:975)
E/AndroidRuntime( 3246): at android.app.LoadedApk.makeApplication(LoadedApk.java:511)
E/AndroidRuntime( 3246): ... 9 more
E/AndroidRuntime( 3246): Suppressed: java.io.IOException: Unable to open dex file: /system/app/GoogleCamera.apk
E/AndroidRuntime( 3246): at dalvik.system.DexFile.openDexFileNative(Native Method)
E/AndroidRuntime( 3246): at dalvik.system.DexFile.openDexFile(DexFile.java:296)
E/AndroidRuntime( 3246): at dalvik.system.DexFile.<init>(DexFile.java:80)
E/AndroidRuntime( 3246): at dalvik.system.DexFile.<init>(DexFile.java:59)
E/AndroidRuntime( 3246): at dalvik.system.DexPathList.loadDexFile(DexPathList.java:263)
E/AndroidRuntime( 3246): at dalvik.system.DexPathList.makeDexElements(DexPathList.java:230)
E/AndroidRuntime( 3246): at dalvik.system.DexPathList.<init>(DexPathList.java:112)
E/AndroidRuntime( 3246): at dalvik.system.BaseDexClassLoader.<init>(BaseDexClassLoader.java:48)
E/AndroidRuntime( 3246): at dalvik.system.PathClassLoader.<init>(PathClassLoader.java:65)
E/AndroidRuntime( 3246): at android.app.ApplicationLoaders.getClassLoader(ApplicationLoaders.java:57)
E/AndroidRuntime( 3246): at android.app.LoadedApk.getClassLoader(LoadedApk.java:326)
E/AndroidRuntime( 3246): at android.app.LoadedApk.makeApplication(LoadedApk.java:508)
E/AndroidRuntime( 3246): ... 9 more
E/AndroidRuntime( 3246): Suppressed: java.lang.ClassNotFoundException: com.android.camera.app.CameraApp
E/AndroidRuntime( 3246): at java.lang.Class.classForName(Native Method)
E/AndroidRuntime( 3246): at java.lang.BootClassLoader.findClass(ClassLoader.java:781)
E/AndroidRuntime( 3246): at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)
E/AndroidRuntime( 3246): at java.lang.ClassLoader.loadClass(ClassLoader.java:504)
E/AndroidRuntime( 3246): ... 12 more
E/AndroidRuntime( 3246): Caused by: java.lang.NoClassDefFoundError: Class "Lcom/android/camera/app/CameraApp;" not found
E/AndroidRuntime( 3246): ... 16 more
W/ActivityManager( 766): Force finishing activity com.android.camera2/com.android.camera.CameraLauncher
W/ActivityManager( 766): Activity pause timeout for ActivityRecord{65e0d8d0 u0 com.android.camera2/com.android.camera.CameraLauncher t5 f}
I/ActivityManager( 766): Killing 1967:com.google.android.keep/u0a52 (adj 15): empty #17