Error running JCA code on EP6 SP11

Has anybody solved this com/sap/util/monitor/jarm/TaskMonitor error with EP6 SP11. Portal can't find the class file.

Portal Runtime Error

An exception occurred while processing a request for :

iView : pcd:portal_content/com.ust.iview.ExplodeBOM

Component Name : com.ust.explodebom.display

com/sap/util/monitor/jarm/TaskMonitor.

Exception id: 05:30_13/05/05_0024_18713050

See the details for the exception ID in the log file