title: android ant error: invalid resource directory name: ./bin/res\crunch
body: <p>I'm using ant command line to build an android project with an external library. (For some reason, I can't make it into a jar to put in libs/)</p>
  
  <p>After completing all the steps of android update and reference link for the project and the lib project, the error of "invalid resource directory name: ./bin/res\crunch" pops out when running "ant release". I know it is a common error but failed to solve it after doing intensive research and trying out all the solutions, including
  1) project->clean
  2) delete ../bin/res/crunch. (it will re-appear and create the trouble)
  3) change android version or SDK version to higher one</p>
  
  <p>Any suggestion? Thanks!</p>