title: org.apache.commons.collections.BeanMap: can't find referenced class java.beans.Introspector
body: <p>I am trying to use Proguard for obfuscating my Android app. Also I am using IntelliJ Idea 11.1.3 to build the release signed APK with <em>Run Proguard</em> option selected in Open Module Settings -> Facets -> Compiler -> Run Proguard.</p>
  
  <p>The application is compiling without any error when I don't use Proguard but with Proguard I am getting the below errors</p>
  
  <pre><code>Error:[MyApp] Warning: org.apache.commons.collections.BeanMap: can't find referenced class java.beans.Introspector
  Error:[MyApp] Warning: org.apache.commons.collections.BeanMap: can't find referenced class java.beans.BeanInfo
  Error:[MyApp] Warning: org.apache.commons.collections.BeanMap: can't find referenced class java.beans.PropertyDescriptor
  Error:[MyApp] Warning: org.apache.commons.collections.BeanMap: can't find referenced class java.beans.IntrospectionException
  Error:[MyApp] Warning: there were 14 unresolved references to classes or interfaces.
  Error:[MyApp]          You may need to specify additional library jars (using '-libraryjars').
  Error:[MyApp] Error: Please correct the above warnings first.
  </code></pre>
  
  <p>How to remove these errors?</p>