android - Activity SetContentView ResourcesNotFound Exception -

first of before wrote question had done search lot in website no solution found. problem title says; just 1 activity in program, activity cant find resources.. other it, every activity can find , works fine. tried everything; "clean , rebuild" ,"switch workspace" , adding "com.myapp.r" top of activity, redownload or close/reopen eclipse" , many more.. checked bug happens in menu folder in "main.xml" ">" instead "/>" anyway.... please find solution. thanks

this activity;

import java.text.decimalformat; import java.text.decimalformatsymbols;  import android.app.activity; import android.app.alertdialog; import android.content.dialoginterface; import android.content.pm.activityinfo; import android.os.bundle; import android.view.view; import android.view.view.onclicklistener; import android.widget.button; import android.widget.edittext; import android.widget.textview;  public class calculator extends activity {  public void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.calculator);     setrequestedorientation(activityinfo.screen_orientation_landscape);      final decimalformat df = new decimalformat("0.00000",                               decimalformatsymbols.getinstance());     decimalformatsymbols symbols = new decimalformatsymbols();     symbols.setdecimalseparator('.');     df.setdecimalformatsymbols(symbols);      final edittext et = (edittext) findviewbyid(r.id.calc_me);     final edittext et2 = (edittext) findviewbyid(r.id.calc_me2);     button copy = (button) findviewbyid(r.id.buttoncopy);     final textview tv = (textview) findviewbyid(r.id.calc_res);      copy.setonclicklistener(new onclicklistener() {          @override         public void onclick(view v) {             // todo auto-generated method stub             if(tv.gettext().tostring().length() >=9)             {                 string s = tv.gettext().tostring();                 s = s.substring(8,s.length());                 et.settext(s);             }         }     }); 

this layout if needed

   <?xml version="1.0" encoding="utf-8"?> <tablelayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent"  android:stretchcolumns="*">  <tablerow android:layout_weight="1">      <edittext     android:id="@+id/calc_me" android:layout_width="match_parent"      android:layout_weight="1"     android:layout_height="wrap_content" android:textsize="20sp" android:inputtype="numbersigned|numberdecimal" />     <edittext     android:id="@+id/calc_me2"  android:layout_width="match_parent" android:layout_weight="1"     android:layout_height="wrap_content" android:textsize="20sp" android:inputtype="numbersigned|numberdecimal" />  </tablerow> <tablerow  android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_weight="1">     <textview android:id="@+id/calc_res" android:layout_height="wrap_content" android:layout_width="wrap_content" android:layout_marginleft="3dp"  android:layout_weight="2" android:textsize="20sp" android:text="result: "/>     <button android:layout_height="wrap_content" android:id="@+id/buttoncopy" android:text="copy"  android:layout_width="fill_parent"/> </tablerow> <tablerow  android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_weight="1">     <button android:layout_height="wrap_content" android:id="@+id/buttonsquare" android:text="√"  android:layout_width="fill_parent"/>     <button android:layout_height="wrap_content" android:id="@+id/buttonpower" android:text="^" android:layout_width="fill_parent"/>     <button android:layout_height="wrap_content" android:id="@+id/buttonpi" android:text="π"  android:layout_width="fill_parent"/> </tablerow> <tablerow  android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_weight="1">     <button android:layout_height="wrap_content" android:id="@+id/buttonsin" android:text="sin" android:layout_weight="1" android:layout_width="fill_parent"/>     <button android:layout_height="wrap_content" android:id="@+id/buttoncos" android:text="cos" android:layout_weight="1" android:layout_width="fill_parent"/>     <button android:layout_height="wrap_content" android:id="@+id/buttontan" android:text="tan" android:layout_weight="1" android:layout_width="fill_parent"/> </tablerow> <tablerow  android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_weight="1">     <button android:layout_height="wrap_content" android:id="@+id/buttonplus" android:text="+"  android:layout_width="fill_parent"/>     <button android:layout_height="wrap_content" android:id="@+id/buttonminus" android:text="-"  android:layout_width="fill_parent"/>     <button android:layout_height="wrap_content" android:id="@+id/buttontimes" android:text="*" android:layout_width="fill_parent"/> </tablerow> <tablerow  android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_weight="1">     <button android:layout_height="wrap_content" android:layout_width="fill_parent"  android:id="@+id/buttonlog" android:text="logb10"/>     <button android:layout_height="wrap_content" android:layout_width="fill_parent"  android:id="@+id/buttone" android:text="e"/>     <button android:layout_height="wrap_content" android:layout_width="fill_parent"  android:id="@+id/buttondivide" android:text="/"/> </tablerow>   </tablelayout> 

hey put line in xml file.actually problem xml file.

<tablelayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:stretchcolumns="*" > 

tested me work perfect.if helpful accept.