title: Error starting Foo: Class 'net.rim.device.api.system.WLANListener' not found
body: <p>I'm new to Blackberry development and have come across something I don't understand.
  I have an application that I have been working on it supports Blackberry OS 5 to 7.1 and works on them all apart from OS 6. For some strange reason I get:</p>
  
  <p>Error starting Foo: Class 'net.rim.device.api.system.WLANListener' not found</p>
  
  <p>on Blackberry OS 6 only! There is no OS specific code (as far as I know). This is after I have cleaned both code and Simulator (using Eclipse) and signed the code. Most of the time the application refuses to install on the OS 6 device - of course, it works perfectly fine on other OS versions. What could be causing this?</p>