Help !! Trying for the first time

Hi<br /><br />Excuse me on asking some basic stuff. I am tryingCairnogorm for the first time.<br /><br />1. In the flex builder, i am getting the following error for MXML file.<br /><br /> Could not resolve <control:PTController> to a component implementation.<br /><br /> <?xml version="1.0" encoding="utf-8"?><br /> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="vertical" ><br /> <control:PTController xmlns:control="com.patientvisitations.control.PTController" /><br /> <rds:Services xmlns:rds="com.patientvisitations.control.delegates.Services" /><br /></mx:Application><br /><br />2. Flex builder does not show any error, in case if there is any error in .as files that I create. Am I missing anything >