exception - Android - Unable to instantiate activity ComponentInfo -

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when try run app error on logcat:

08-23 17:32:01.700: e/androidruntime(4518): fatal exception: main 08-23 17:32:01.700: e/androidruntime(4518): java.lang.runtimeexception: unable instantiate activity componentinfo{com.app.myapp/com.library.core.presentation.sessionactivity}: java.lang.nullpointerexception 08-23 17:32:01.700: e/androidruntime(4518): @ android.app.activitythread.performlaunchactivity(activitythread.java:1573) 08-23 17:32:01.700: e/androidruntime(4518): @ android.app.activitythread.handlelaunchactivity(activitythread.java:1667)

the problem appears when touch on list item, corresponding intent:

public void onitemclick(adapterview<?> adapterview, view view, int position, long id)         {             intent sessionintent = new intent(view.getcontext(), sessionactivity.class);                             //sessionintent.putextras(bundle);                                   startactivity(sessionintent);          }

sessionactivity class contained in library project have use app. manifest file this:

    <?xml version="1.0" encoding="utf-8"?>     <manifest xmlns:android="http://schemas.android.com/apk/res/android"     package="com.app.myapp"     android:versioncode="1"     android:versionname="1.0" >      <uses-sdk         android:minsdkversion="8"         android:targetsdkversion="10" />       <application         android:allowbackup="true"         android:icon="@drawable/ic_launcher"         android:label="@string/app_name"         android:theme="@style/apptheme" >         <activity             android:name="com.rdp.rdp_prova.mainactivity"             android:label="@string/app_name" >             <intent-filter>                 <action android:name="android.intent.action.main" />                  <category android:name="android.intent.category.launcher" />              </intent-filter>         </activity>                  <activity android:name="com.library.core.presentation.sessionactivity" />      </application>  </manifest>

what's wrong?


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