title: Error on previwe in ireport on netbeans 7
body: <p>I am developing project on net-beans and I have successfully install the ireport plugin for netbeans. After that I have create simple report on ireport but when I try to preview it gave following error.</p>
  
  <pre><code>Compiling to file... C:\Users\Public\Documents\Nirmal\Project_Final_Nangi\Project_Final_Nangi\80%of Project\Copy of nadee_Final\src\project\report1.jasper
  Error compiling the report java source!
  java.lang.NoClassDefFoundError: Could not initialize class com.jaspersoft.ireport.designer.compiler.ExtendedJRJdtCompiler
  at com.jaspersoft.ireport.designer.compiler.IReportCompiler.run(IReportCompiler.java:501)
  at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1424)
  at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1968)
  </code></pre>
  
  <p>Can someone explain how can I solve this problem ?</p>