title: Errors in creating a simple android project
body: <p>I have created few small application few days back using android SDK 4.4.2 API 19. But when I have updated the sdk to 5.0 and API 21 i get the following problems:</p>
  
  <blockquote>
    <p>Description   Resource    Path    Location    Type
    Project 'appcompat_v7' is missing required source folder: 'gen' appcompat_v7        Build path  Build Path Problem</p>
    
    <p>The project cannot be built until build path errors are resolved  HOS     Unknown Java Problem</p>
    
    <p>The project cannot be built until build path errors are
    resolved  appcompat_v7        Unknown Java Problem</p>
    
    <p>The container 'Android Dependencies' references non existing library '/mnt/devel/home/amulya/workspace/appcompat_v7/bin/appcompat_v7.jar' </p>
  </blockquote>
  
  <p>In the console I get these errors:</p>
  
  <blockquote>
    <blockquote>
      <p>[2014-10-27 11:40:47 - appcompat_v7] WARNING: unable to write jarlist cache file
      /mnt/devel/home/amulya/workspace/appcompat_v7/bin/jarlist.cache</p>
    </blockquote>
    
    <p>[2014-10-27 11:40:47 - appcompat_v7] WARNING: unable to write jarlist
    cache file
    /mnt/devel/home/amulya/workspace/appcompat_v7/bin/jarlist.cache
    [2014-10-27 11:40:48 - HOS]
    /mnt/devel/home/amulya/workspace/appcompat_v7/res/values-v21/styles_base.xml:75:
    error: Error retrieving parent for item: No resource found that
    matches the given name 'android:Widget.Material.ActionButton'.</p>
    
    <p>[2014-10-27 11:40:48 - HOS]  [2014-10-27 11:40:48 - HOS]
    /mnt/devel/home/amulya/workspace/appcompat_v7/res/values-v21/styles_base.xml:79:
    error: Error retrieving parent for item: No resource found that
    matches the given name
    'android:Widget.Material.ActionButton.CloseMode'.</p>
  </blockquote>
  
  <p>I went through many questions and answers in stackoverflow but i couldn't get rid of this problem. Please do help me. Thanks in advance</p>