java.io.IOException occurs in messages.log file when execute a webservice in an EJB module app

STEPS TO REPRODUCE:
1. Install netbean nightly 6.0 - dated 08/20/2207 with glassfishV2-58
2. Create an EJB module
3. Add a webservice from WSDL file to the recently created EJB Module
4. Build and deploy the ejb jar file to glassfish server
5. Open glassfish GUI console > expand Webservices node > select endpoint node > click Test button
(Note: When I delete the EJB project, another exception message appears on the IDE)  
BUG:
     java.io.IOException
        at org.netbeans.modules.web.monitor.data.MonitorData.createGraph(MonitorData.java:528)
        at org.netbeans.modules.web.monitor.data.MonitorData.createGraph(MonitorData.java:511)
[catch] at org.netbeans.modules.web.monitor.client.Controller.retrieveMonitorData(Controller.java:1
        at org.netbeans.modules.web.monitor.client.Controller.retrieveMonitorData(Controller.java:1
        at org.netbeans.modules.web.monitor.client.Controller.addTransaction(Controller.java:161)
        at org.netbeans.modules.web.monitor.client.MonitorAction.addTransaction(MonitorAction.java:
        at org.netbeans.modules.web.monitor.client.PutTransaction$1.run(PutTransaction.java:150)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)
[Fatal Error] :75:3289: The character reference must end with the ';' delimiter.