IssueTracker

First of all, sorry for my poor english.

I really agree.
My app crashes only in cetain phone even if the build number is same!

09-23 11:05:53.718: E       754      Parcel                               Class not found when unmarshalling: com.samilcts.mpaio.data.Receipt
09-23 11:05:53.718: E       754      Parcel                               java.lang.ClassNotFoundException: com.samilcts.mpaio.data.Receipt
09-23 11:05:53.718: E       754      Parcel                                     at java.lang.Class.classForName(Native Method)
09-23 11:05:53.718: E       754      Parcel                                     at java.lang.Class.forName(Class.java:251)
09-23 11:05:53.718: E       754      Parcel                                     at java.lang.Class.forName(Class.java:216)
09-23 11:05:53.718: E       754      Parcel                                     at android.os.Parcel.readParcelableCreator(Parcel.java:2133)
09-23 11:05:53.718: E       754      Parcel                                     at android.os.Parcel.readParcelable(Parcel.java:2097)
09-23 11:05:53.718: E       754      Parcel                                     at android.os.Parcel.readValue(Parcel.java:2013)
09-23 11:05:53.718: E       754      Parcel                                     at android.os.Parcel.readArrayMapInternal(Parcel.java:2314)
09-23 11:05:53.718: E       754      Parcel                                     at android.os.Bundle.unparcel(Bundle.java:249)
09-23 11:05:53.718: E       754      Parcel                                     at android.os.Bundle.getString(Bundle.java:1118)
09-23 11:05:53.718: E       754      Parcel                                     at android.content.Intent.getStringExtra(Intent.java:4991)
09-23 11:05:53.718: E       754      Parcel                                     at com.android.server.am.ActivityStackSupervisor.startActivityLocked(ActivityStackSupervisor.java:1394)
09-23 11:05:53.718: E       754      Parcel                                     at com.android.server.am.ActivityStackSupervisor.startActivityMayWait(ActivityStackSupervisor.java:1026)
09-23 11:05:53.718: E       754      Parcel                                     at com.android.server.am.ActivityManagerService.startActivityAsUser(ActivityManagerService.java:3984)
09-23 11:05:53.718: E       754      Parcel                                     at com.android.server.am.ActivityManagerService.startActivity(ActivityManagerService.java:3887)
09-23 11:05:53.718: E       754      Parcel                                     at android.app.ActivityManagerNative.onTransact(ActivityManagerNative.java:159)
09-23 11:05:53.718: E       754      Parcel                                     at com.android.server.am.ActivityManagerService.onTransact(ActivityManagerService.java:2576)
09-23 11:05:53.718: E       754      Parcel                                     at android.os.Binder.execTransact(Binder.java:404)
09-23 11:05:53.718: E       754      Parcel                                     at dalvik.system.NativeStart.run(Native Method)
09-23 11:05:53.718: E       754      Parcel                               Caused by: java.lang.NoClassDefFoundError: com/samilcts/mpaio/data/Receipt
09-23 11:05:53.718: E       754      Parcel                                     ... 18 more
09-23 11:05:53.718: E       754      Parcel                               Caused by: java.lang.ClassNotFoundException: Didn't find class "com.samilcts.mpaio.data.Receipt" on path: DexPathList[[directory "."],nativeLibraryDirectories=[/vendor/lib, /system/lib]]
09-23 11:05:53.718: E       754      Parcel                                     at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:67)
09-23 11:05:53.718: E       754      Parcel                                     at java.lang.ClassLoader.loadClass(ClassLoader.java:497)
09-23 11:05:53.718: E       754      Parcel                                     at java.lang.ClassLoader.loadClass(ClassLoader.java:457)
09-23 11:05:53.718: E       754      Parcel                                     ... 18 more

I also see the same few reports (usually after an update) and users sometimes complain with bad reviews about it too.

java.lang.RuntimeException: Unable to instantiate application com.mindmeapp.alarmpad.App: java.lang.ClassNotFoundException: Didn't find class "com.mindmeapp.alarmpad.App" on path: DexPathList[[],nativeLibraryDirectories=[/vendor/lib, /system/lib]]
at android.app.LoadedApk.makeApplication(LoadedApk.java:507)
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4301)
at android.app.ActivityThread.access$1500(ActivityThread.java:135)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5001)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.ClassNotFoundException: Didn't find class "com.mindmeapp.alarmpad.App" on path: DexPathList[[],nativeLibraryDirectories=[/vendor/lib, /system/lib]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
at java.lang.ClassLoader.loadClass(ClassLoader.java:497)
at java.lang.ClassLoader.loadClass(ClassLoader.java:457)
at android.app.Instrumentation.newApplication(Instrumentation.java:975)
at android.app.LoadedApk.makeApplication(LoadedApk.java:502)
... 11 more

An "operating system" that can't handle properly installing apps?

Hope it's not that, but rather crazy green aliens from outer space... :)