Is it normal to see ClassNotFoundException when opening Google Plus app?

I recently have my first Android phone. It is a Samsung Galaxy Grand Prime (KitKat). It is not rooted yet and all apps are from Google Play.

Every time I launched Google Plus or Google Photo, I see the following Exception in logcat:

E/Parcel: Class not found when unmarshalling: itw
java.lang.ClassNotFoundException: itw
   at java.lang.Class.classForName(Native method)
   ...
Caused by: java.lang.ClassNotFoundException: Didn't find class "itw" on path: DexPathList[[directory "."],nativeLibraryDirectories=[/vendor/lib, /system/lib]]
   at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)

com.google.android.talk also have the following single error message without stack trace (these errors are from the same process id):

E/dalvikvm: Could not find class 'av', referenced from method f.a
E/dalvikvm: Could not find class 'ax', referenced from method f.a
E/dalvikvm: Could not find class 'android.app.RemoteInput[]', referenced from method f.a
E/Babel: canonicalizeMccMnc: invalid mccmnc
E/Babel: canonicalizeMccMnc: inavlid mcccmnc nullnull
E/dalvikvm: Could not find class 'com.google.android.libraries.hangouts.video.ScreenCaptureVideoSource$2', referenced from method com.google.android.libraries.hangouts.video.ScreenCaptureVideoSource.<init>`

Looks like itw, ax, f.a, etc are obfuscated names. I would like to know wether these errors are normal or not.