[news.eclipse.platform.swt] help me ,thank you!

["boylaboy" <webmaster@xxxxxxxxxxxxxxx>]

Hi All:
      I meet a problem!I need your help,thank you!
      Ok,there is a project.It's all right when be builded.But it go wrong
when running.
      The System hints :
           java.lang.NoClassDefFoundError:
org/eclipse/core/internal/boot/DelegatingURLClassLoader
           at org.eclipse.core.runtime.Platform.run(Platform.java:413)
           at
org.eclipse.jface.viewers.StructuredViewer.updateItem(StructuredViewer.java:
1271)
           at
org.eclipse.jface.viewers.TableViewer.internalRefresh(TableViewer.java:494)
           at
org.eclipse.jface.viewers.TableViewer.internalRefresh(TableViewer.java:431)
           at
org.eclipse.jface.viewers.StructuredViewer$7.run(StructuredViewer.java:861)
           at
org.eclipse.jface.viewers.StructuredViewer.preservingSelection(StructuredVie
wer.java:801)
           at
org.eclipse.jface.viewers.StructuredViewer.refresh(StructuredViewer.java:859
)
           at
org.eclipse.jface.viewers.StructuredViewer.refresh(StructuredViewer.java:821
)
           at
org.eclipse.jface.viewers.TableViewer.inputChanged(TableViewer.java:398)
           at
org.eclipse.jface.viewers.ContentViewer.setInput(ContentViewer.java:238)
           at
org.eclipse.jface.viewers.StructuredViewer.setInput(StructuredViewer.java:99
1)
           at
com.opnworks.tableviewer.example.TableViewerExample.addChildControls(TableVi
ewerExample.java:155)
           at
com.opnworks.tableviewer.example.TableViewerExample.<init>(TableViewerExampl
e.java:46)
           at
com.opnworks.tableviewer.example.TableViewerExample.main(TableViewerExample.
java:85)
           Exception in thread "main"
      I don't know where goes wrong!Please help me,thank you very much!