title: java.lang.IllegalArgumentException: No view found for id 0x7f0c007b
body: <p>I tried to start a App project and now i get the following error. </p>
  
  <p>I tried a lot from the answers that i found here on the side, but I don't found my mistake.</p>
  
  <p>Here is the output:</p>
  
  <pre>
  E/AndroidRuntime: FATAL EXCEPTION: main
                    Process: de.christian_heinisch.tiercheckliste, PID: 28372
                    java.lang.IllegalArgumentException: No view found for id 0x7f0c007b (de.christian_heinisch.tiercheckliste:id/relativeLayout_for_About) for fragment AboutFragment{5abcffb #0 id=0x7f0c007b}
                        at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1102)
                        at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1290)
                        at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:801)
                        at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1677)
                        at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:536)
                        at android.os.Handler.handleCallback(Handler.java:739)
                        at android.os.Handler.dispatchMessage(Handler.java:95)
                        at android.os.Looper.loop(Looper.java:148)
                        at android.app.ActivityThread.main(ActivityThread.java:5466)
                        at java.lang.reflect.Method.invoke(Native Method)
                        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
                        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
  I/Process: Sending signal. PID: 28372 SIG: 9
  Application terminated.
  </pre>
  
  <p>Here is my MainActivity</p>
  
  <pre><code>package de.christian_heinisch.tiercheckliste;
  
  import android.os.Bundle;
  import android.support.design.widget.FloatingActionButton;
  import android.support.design.widget.Snackbar;
  import android.support.v4.app.FragmentManager;
  import android.support.v4.app.FragmentTransaction;
  import android.view.View;
  import android.support.design.widget.NavigationView;
  import android.support.v4.view.GravityCompat;
  import android.support.v4.widget.DrawerLayout;
  import android.support.v7.app.ActionBarDrawerToggle;
  import android.support.v7.app.AppCompatActivity;
  import android.support.v7.widget.Toolbar;
  import android.view.Menu;
  import android.view.MenuItem;
  import android.widget.Toast;
  
  public class MainActivity extends AppCompatActivity
          implements NavigationView.OnNavigationItemSelectedListener {
  
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_main);
          Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
          setSupportActionBar(toolbar);
  
          FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
          fab.setOnClickListener(new View.OnClickListener() {
              @Override
              public void onClick(View view) {
                  Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                          .setAction("Action", null).show();
              }
          });
  
          DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
          ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
                  this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
          drawer.addDrawerListener(toggle);
          toggle.syncState();
  
          NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
          navigationView.setNavigationItemSelectedListener(this);
      }
  
      @Override
      public void onBackPressed() {
          DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
          if (drawer.isDrawerOpen(GravityCompat.START)) {
              drawer.closeDrawer(GravityCompat.START);
          } else {
              super.onBackPressed();
          }
      }
  
      @Override
      public boolean onCreateOptionsMenu(Menu menu) {
          // Inflate the menu; this adds items to the action bar if it is present.
          getMenuInflater().inflate(R.menu.main, menu);
          return true;
      }
  
      @Override
      public boolean onOptionsItemSelected(MenuItem item) {
          // Handle action bar item clicks here. The action bar will
          // automatically handle clicks on the Home/Up button, so long
          // as you specify a parent activity in AndroidManifest.xml.
          int id = item.getItemId();
  
          //noinspection SimplifiableIfStatement
          if (id == R.id.action_settings) {
              return true;
          }
  
          return super.onOptionsItemSelected(item);
      }
  
      @SuppressWarnings("StatementWithEmptyBody")
      @Override
      public boolean onNavigationItemSelected(MenuItem item) {
          // Handle navigation view item clicks here.
          int id = item.getItemId();
  
          if (id == R.id.nav_pet_about) {
  
          } else if (id == R.id.nav_pet_info) {
  
          } else if (id == R.id.nav_pet_checklist) {
  
          } else if (id == R.id.nav_info) {
  
              AboutFragment aboutFragment = new AboutFragment();
              FragmentTransaction manager = getSupportFragmentManager().beginTransaction();
              manager.replace(R.id.relativeLayout_for_About, aboutFragment);
              manager.addToBackStack(null);
              manager.commit();
  
          }
  
          DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
          drawer.closeDrawer(GravityCompat.START);
          return true;
      }
  }
  </code></pre>
  
  <p>Here is my fragment_about.xml</p>
  
  <pre><code>&lt;RelativeLayout 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"
      tools:context="de.christian_heinisch.tiercheckliste.AboutFragment"
      android:id="@+id/relativeLayout_for_About"&gt;
  
      &lt;!-- TODO: Update blank fragment layout --&gt;
      &lt;TextView
          android:layout_width="match_parent"
          android:layout_height="match_parent"
          android:text="@string/hello_blank_fragment" /&gt;
  
  &lt;/RelativeLayout&gt;
  </code></pre>
  
  <p>And here is my AboutFragment.java</p>
  
  <pre><code>package de.christian_heinisch.tiercheckliste;
  
  
  import android.os.Bundle;
  import android.support.v4.app.Fragment;
  import android.view.LayoutInflater;
  import android.view.View;
  import android.view.ViewGroup;
  
  
  /**
   * A simple {@link Fragment} subclass.
   */
  public class AboutFragment extends Fragment {
  
  
      public AboutFragment() {
          // Required empty public constructor
      }
  
  
      @Override
      public View onCreateView(LayoutInflater inflater, ViewGroup container,
                               Bundle savedInstanceState) {
          // Inflate the layout for this fragment
          return inflater.inflate(R.layout.fragment_about, container, false);
      }
  
  }
  </code></pre>
  
  <p>Does anyone have an idea what is wrong?</p>