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

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i running list-fragment program , @ run-time got below error.

error:

**02-09 09:03:40.213: error/androidruntime(572): java.lang.runtimeexception: unable 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 reason.my program contains 3 classes- detailsfragment.java, fragmentstitles.java , shakespear.java can 1 me out please....

at time if error stating unable instantiate activity componentinfo means code has error. error shown in log cat caused by:......... 1.caused by: android.view.inflateexception: binary xml file line #13: error inflating class fragment(this indicates there error in xml , activity has inflating problem. can know error , if rectify error problem solved.


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