Hi I have main activity with layout like 

<?xml version="1.0" encoding="utf-8"?><LinearLayout 
xmlns:android="http://schemas.android.com/apk/res/android";  
android:layout_width="fill_parent" android:layout_height="fill_parent"  
android:orientation="vertical" android:background="#ffffff">    <LinearLayout 
xmlns:android="http://schemas.android.com/apk/res/android";                
android:layout_width="fill_parent" android:layout_height="wrap_content"         
android:orientation="horizontal" android:weightSum="9"          
android:background="@drawable/buttonsborder">           <Button 
android:id="@+id/Chemo" android:layout_width="0dp"                      
android:layout_weight="1" android:layout_height="wrap_content"                  
android:text="Chemo" android:background="@drawable/firstbuttoncolorstyle"       
                android:textColor="@drawable/firstbuttontextstyle" 
android:textSize="22dp"                      android:layout_gravity="center" /> 
             <Button android:id="@+id/inpatient" android:layout_width="0dp"     
             android:layout_weight="1" android:layout_height="wrap_content"     
             android:text="Inpatient" 
android:background="@drawable/firstbuttoncolorstyle"                   
android:textColor="@drawable/firstbuttontextstyle" android:textSize="22dp"      
                android:layout_gravity="center" android:layout_marginLeft = 
"5dp"/>     </LinearLayout> <!-- the two columns part -->   <LinearLayout 
xmlns:android="http://schemas.android.com/apk/res/android";                
android:layout_width="fill_parent" android:layout_height="fill_parent"          
android:layout_weight="0.80" android:orientation="horizontal"                   
        >               <LinearLayout 
xmlns:android="http://schemas.android.com/apk/res/android";                      
  android:layout_width="fill_parent" android:layout_height="fill_parent"        
          android:layout_weight="1.5" android:id="@+id/submenue"                
  android:background="@drawable/submenuestyle"                    >             
  </LinearLayout>         <LinearLayout 
xmlns:android="http://schemas.android.com/apk/res/android";                      
  android:layout_width="fill_parent" android:layout_height="fill_parent"        
          android:layout_weight=".40" android:id="@+id/mainLayout">             
  </LinearLayout> </LinearLayout></LinearLayout>


I add fragment to mainLayout using this code 

public class maincontrolActivity extends FragmentActivity  {    Button Chemo;   
Button inpatient;       Button Mgmt;    Button PatientSearch;   Button 
AppointSearch ;  Button LogOut;  ListView menueview;     String[] MainMenue ;   
 private static final int ALERT_DIALOG = 1;      ArrayList<TreatementBasic> 
TDayList ;           final FragmentManager fragmentManager = 
getSupportFragmentManager();        /** Called when the activity is first 
created. */    @Override    public void onCreate(Bundle savedInstanceState) {   
   super.onCreate(savedInstanceState);        
setContentView(R.layout.maincontrol);    this.inpatient.setOnClickListener(new 
OnClickListener() {            public void onClick(View v) {                    
         LinearLayout formLayout = (LinearLayout)findViewById(R.id.mainLayout); 
         formLayout.removeAllViews();                              
FragmentTransaction fragmentTransaction =      
fragmentManager.beginTransaction();                                           
//PatientSearch fragment = new PatientSearch(maincontrolActivity.this);         
                   fragmentTransaction.add(R.id.mainLayout,type, "MY_FRAG");    
          fragmentTransaction.commit();                                         
     }        });        }

in this fragment I want to reload another using 


startActivity(new Intent(PatientSearch.this.getActivity(), 
AppointementSearch.class).putExtra("Position",0)); but it crash with log :


07-18 14:24:31.145: E/AndroidRuntime(27449): java.lang.RuntimeException: Unable 
to instantiate activity 
ComponentInfo{com.appnetics/com.appnetics.AppointementSearch}: 
java.lang.InstantiationException: com.appnetics.AppointementSearch
07-18 14:24:31.145: E/AndroidRuntime(27449):    at 
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1739)
07-18 14:24:31.145: E/AndroidRuntime(27449):    at 
android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1831)
07-18 14:24:31.145: E/AndroidRuntime(27449):    at 
android.app.ActivityThread.access$500(ActivityThread.java:122)
07-18 14:24:31.145: E/AndroidRuntime(27449):    at 
android.app.ActivityThread$H.handleMessage(ActivityThread.java:1024)
07-18 14:24:31.145: E/AndroidRuntime(27449):    at 
android.os.Handler.dispatchMessage(Handler.java:99)
07-18 14:24:31.145: E/AndroidRuntime(27449):    at 
android.os.Looper.loop(Looper.java:132)
07-18 14:24:31.145: E/AndroidRuntime(27449):    at 
android.app.ActivityThread.main(ActivityThread.java:4123)
07-18 14:24:31.145: E/AndroidRuntime(27449):    at 
java.lang.reflect.Method.invokeNative(Native Method)
07-18 14:24:31.145: E/AndroidRuntime(27449):    at 
java.lang.reflect.Method.invoke(Method.java:491)
07-18 14:24:31.145: E/AndroidRuntime(27449):    at 
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:849)
07-18 14:24:31.145: E/AndroidRuntime(27449):    at 
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:607)



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