title: Red Exclamation (!) Mark on my project name in eclipse
body: <p>I imported one project in Eclipse. but it showing me Red exclamation mark next to my project name.i have seen this Question has been asked many times here. I tried some solutions but those answers does not solve my problem. so i decided to post the Question.</p>
  
  <p>Following warnings in console:</p>
  
  <p>[2014-09-04 01:28:17 - Todo] Project has no project.properties file!     Edit the project properties to set one.
  [2014-09-04 01:28:23 - Todo] Android requires compiler compliance level 5.0 or 6.0. Found '1.7' instead. Please use Android Tools > Fix Project Properties.
  [2014-09-04 01:29:25 - Todo] Android requires compiler compliance level 5.0 or 6.0. Found '1.7' instead. Please use Android Tools > Fix Project Properties.</p>
  
  <p>After trying some solution More Errors:</p>
  
  <p>Error executing aapt: Return code -1073741819       Todo        line 1  Android ADT Problem<br>
  Project 'Todo' is missing required library: 'C:\Users\sunny\Desktop\adt-bundle-windows-x86_64-20140624\sdk\platforms\android-20\android.jar'    </p>