title: jar mismatch, fix your dependencies
body: <p>i've created a new android application project and i got error as soon as it was created.</p>
  
  <pre><code>Found 2 versions of android-support-v4.jar in the dependency list,
  but not all the versions are identical (check is based on SHA-1 only at this time).
  All versions of the libraries must be the same at this time.
  Versions found are:
  Path: /asuspc/workspace/appcompat_v7/libs/android-support-v4.jar
      Length: 349252
      SHA-1: 612846c9857077a039b533718f72db3bc041d389
  Path: /asuspc/workspace/USCConverter/libs/android-support-v4.jar
      Length: 337562
      SHA-1: 27c24d26e4c5d57976e6926367985548678e913c
  </code></pre>
  
  <p>then i searched for answer and some people say i should delete android-support-v4.jar from libs folder and use only one.
  when i deleted it from USCConverter project it wasn't solved.
  then i restored it and deleted from appcompat_v7 and now there is no any error.
  but i'm afraid will this mess something up?
  i don't feel like deleting files would solve a problem.
  and sorry if this sounds stupid, but i'm kind of newbie, what is this appcompat_v7 anyway?
  and how come projects i created before didn't have this error, even though they had android-support-v4.jar as well?
  Thanks in advance!</p>