Android Runtime Exception: Unable to instantiate activity componentInfo? - android

i am running a list-fragment program and at run-time i got the below error.
Error:
**02-09 09:03:40.213: ERROR/AndroidRuntime(572): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{ni.android.Fragment/ni.android.Fragment.Fragment}: java.lang.ClassNotFoundException: ni.android.Fragment.Fragment in loader dalvik.system.PathClassLoader[/data/app/ni.android.Fragment-1.apk]**
I don't know the reason.My program contains three classes- DetailsFragment.java, FragmentsTitles.java and Shakespear.java can any one help me out please....

At any time if you get an error stating Unable to instantiate activity ComponentInfo
That means your code has some error.
That error will be shown in log cat As Caused by:.........
1.Caused by: android.view.InflateException: Binary XML file line #13: Error inflating class fragment(This indicates that there is an error in xml and the activity has inflating problem.
By this you can know what is the error and if you rectify that error then your problem will be solved.

This blog will solve this issue.
http://android.foxykeep.com/dev/how-to-fix-the-classdefnotfounderror-with-adt-17
Thanks

I had this error as well (beginner) and I noticed that I forgot to create the onCreate method in my activity class. Once I created that, the error went away.

If you have like this warning before error:
05-16 10:08:00.033: W/dalvikvm(1695): Unable to resolve superclass of Lmy/fragment/test/FragmentTestActivity; (7)
05-16 10:08:00.076: W/dalvikvm(1695): Link of class 'Lmy/fragment/test/FragmentTestActivity;' failed
Should export android-support-v4 to right to your app:
Configure Java Build Path -> Order And Export tab -> set checkbox android-support-v4.jar
(Maybe need to remove existing one firstly)

Make sure you are not only looking at error logcat ... as the error may be seen using verbose. But I agree with #parameshwar-s

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check this answer.

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I got the solution. The applicationId in build.gradle and the package in the manifest were not matching. Once I changed it, it worked.
Strange though, I had thought that the reason the two were separated was so that they could be named differently. In any case, that was what got it working.

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I am really getting desperate.
I have a working app - theoretically.
Tried to change the sdk version from 8 to 13.
Now when I start the app I get a Fatal exception, or rather a ClassNotFoundException for the very first activity started:
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clean rebuild and restart project.. btw do you have any additional libraries??
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lol..

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