title: Unable to resolve sdk.buildtools property value '18.1.0'
body: <p>I'm getting this error and cannot compile my android program. Here is my <em>project.properties</em> file:</p>
  
  <pre><code>target=android-22
  android.library.reference.1=../appcompat_v7
  renderscript.target=18
  renderscript.support.mode=true
  sdk.buildtools=18.1.0
  </code></pre>
  
  <p>How do I fix this? Thanks in advance!</p>