title: cannot find the declaration of element 'linearlayout'
body: <p>I am new to Android and learning with a book.But here comes the problem. When I decided to add a folder named layout_larger and copied the file named <code>activity_one_page_or_two.xml</code> to <code>layout_larger</code>, unfortunately I occurred the 
  <code>error : Error:(4, 43) cvc-elt.1.a: Cannot find the declaration of element LinearLayout</code>.No idea why it comes. Anyone could give me a hand?</p>
  
  <p><img src="https://i.stack.imgur.com/WdBd6.png" alt="Enter image description here"></p>
  
  <p><img src="https://i.stack.imgur.com/QdyNk.png" alt="Enter image description here"></p>