title: AAPT: error: not well-formed (invalid token). Despite all trials this error continues to pop
body: <p>I am making an app for a tic tac toe game using android studio . But it's showing this error .
  I am unable to find any mistake in this xml code. Until now i have not written any code in main activity . This didnt worked in this phase itself. I am a beginner in android development</p>
  <p>Here's my entire code.</p>
  <pre><code>?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;
  &lt;androidx.constraintlayout.widget.ConstraintLayout xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
      xmlns:app=&quot;http://schemas.android.com/apk/res-auto&quot;
      xmlns:tools=&quot;http://schemas.android.com/tools&quot;
      android:layout_width=&quot;match_parent&quot;
      android:layout_height=&quot;match_parent&quot;
      tools:context=&quot;.MainActivity&quot;&gt;
  
      &lt;androidx.gridlayout.widget.GridLayout
          android:id=&quot;@+id/gridLayout&quot;
          android:layout_width=&quot;400dp&quot;
          android:layout_height=&quot;400dp&quot;
          android:layout_margin=&quot;8dp&quot;
          android:background=&quot;@drawable/board&quot;
          app:rowCount=&quot;3&quot;
          app:columnCount=&quot;3&quot;
          app:layout_constraintBottom_toBottomOf=&quot;parent&quot;
          app:layout_constraintEnd_toEndOf=&quot;parent&quot;
          app:layout_constraintStart_toStartOf=&quot;parent&quot;
          app:layout_constraintTop_toTopOf=&quot;parent&quot;&gt;
  
          &lt;ImageView
              android:id=&quot;@+id/imageView1&quot;
              android:layout_width=&quot;106dp&quot;
              android:layout_height=&quot;106dp&quot;
              android:layout_margin=&quot;11dp&quot;
              app:srcCompat=&quot;@drawable/greengoti&quot; /&gt;
  
          &lt;ImageView
              android:id=&quot;@+id/imageView2&quot;
              android:layout_width=&quot;106dp&quot;
              android:layout_height=&quot;106dp&quot;
              android:layout_margin=&quot;11dp&quot;
              app:srcCompat=&quot;@drawable/greengoti&quot; /&gt;
  
          &lt;ImageView
              android:id=&quot;@+id/imageView3&quot;
              android:layout_width=&quot;106dp&quot;
              android:layout_height=&quot;106dp
  
              android:layout_margin=&quot;11dp&quot;
              android:layout_marginLeft=&quot;20dp&quot;
              app:srcCompat=&quot;@drawable/greengoti&quot; /&gt;
          &lt;ImageView
              android:id=&quot;@+id/imageView4&quot;
              android:layout_width=&quot;106dp&quot;
              android:layout_height=&quot;106dp&quot;
  
              android:layout_margin=&quot;11dp&quot;
  
              app:srcCompat=&quot;@drawable/greengoti&quot; /&gt;
  
          &lt;ImageView
              android:id=&quot;@+id/imageView5&quot;
              android:layout_width=&quot;106dp&quot;
              android:layout_height=&quot;106dp&quot;
  
              android:layout_margin=&quot;11dp&quot;
  
              app:srcCompat=&quot;@drawable/greengoti&quot; /&gt;
          &lt;ImageView
              android:id=&quot;@+id/imageView6&quot;
              android:layout_width=&quot;106dp&quot;
              android:layout_height=&quot;106dp&quot;
  
              android:layout_margin=&quot;11dp&quot;
              android:layout_marginLeft=&quot;20dp&quot;
  
              app:srcCompat=&quot;@drawable/greengoti&quot; /&gt;
          &lt;ImageView
              android:id=&quot;@+id/imageView7&quot;
              android:layout_width=&quot;106dp&quot;
              android:layout_height=&quot;106dp&quot;
  
              android:layout_margin=&quot;11dp&quot;
              android:layout_marginTop=&quot;22dp&quot;
  
              app:srcCompat=&quot;@drawable/greengoti&quot; /&gt;
          &lt;ImageView
              android:id=&quot;@+id/imageView8&quot;
              android:layout_width=&quot;106dp&quot;
              android:layout_height=&quot;106dp&quot;
  
              android:layout_margin=&quot;11dp&quot;
              android:layout_marginTop=&quot;22dp&quot;
  
              app:srcCompat=&quot;@drawable/greengoti&quot; /&gt;
          &lt;ImageView
              android:id=&quot;@+id/imageView9&quot;
              android:layout_width=&quot;106dp&quot;
              android:layout_height=&quot;106dp&quot;
  
              android:layout_margin=&quot;11dp&quot;
              android:layout_marginLeft=&quot;20dp&quot;
              android:layout_marginTop=&quot;22dp&quot;
  
              app:srcCompat=&quot;@drawable/greengoti&quot; /&gt;
  
  
      &lt;/androidx.gridlayout.widget.GridLayout&gt;
  &lt;/androidx.constraintlayout.widget.ConstraintLayout&gt;
  </code></pre>