OStatic

Hi I am getting below errors while installing/configuring PMD with workshop 8.1.
I followed the steps given in sourceforge to configure pmd with weblogic workshop
Plz give any solution/suggestion to solve this

java.lang.NoClassDefFoundError: net/sourceforge/pmd/RuleSetFactory
at com.bearingpoint.bea.wlw.extensions.pmd.DefaultMenuGenerator.getRuleSets(DefaultMenuGenerator.java:124)
at com.bearingpoint.bea.wlw.extensions.pmd.DefaultMenuGenerator.populate(DefaultMenuGenerator.java:66)
at workshop.shell.commands.CmdManager.invokeGenerator(CmdManager.java:651)
at workshop.shell.commands.CmdManager.populateMenu(CmdManager.java:784)
at workshop.shell.commands.CmdManager.loadMainMenu(CmdManager.java:695)
at workshop.shell.commands.CmdManager.access$1100(CmdManager.java:38)
at workshop.shell.commands.CmdManager$RefreshUI.run(CmdManager.java:543)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:178)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:454)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:145)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:137)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:100)