eclipse - WindowBuilder encountered unexpected internal error; Cannot cast? -


i'm trying run windowbuilder build swt apps. however, when click design tab, error:

enter image description here

the code i'm using produces above error basic default code when starting new project. same error occurs when try run actual swt project run when executed within java:

here's code:

package ch2; import org.eclipse.swt.*;  public class helloswt {      public static void main(string[] args) {         // todo auto-generated method stub         display display = new display();         shell shell = new shell(display);         shell.settext("hello world");         shell.setbounds(100, 100, 200, 50);          //layout         rowlayout rowlay = new rowlayout(swt.horizontal);         rowlay.justify = true;         rowlay.margintop = 20;         rowlay.marginbottom = 20;         //form layout         formdata formdata = new formdata();         formdata.right = new formattachment(100, -5);         formdata.bottom = new formattachment(100, -5);           //shell.setlayout(new filllayout(swt.vertical));         shell.setlayout(rowlay);          final label label = new label(shell, swt.center);         label.settext("hello inside world");             org.eclipse.swt.graphics.color red = new org.eclipse.swt.graphics.color(display, 255, 0, 0);         label.setforeground(red);          //button          final button button = new button(shell, 0);         button.settext("a button");             image img = new image(display, "c:\\users\\ra_stein\\pictures\\koala.png");         button.setimage(img);         button.setforeground(red);         button.pack();         button.addselectionlistener(new selectionadapter(){             public void widgetselected(selectionevent event){                 button.settext("a clicked button");                 label.settext("hello yourself");             }         });          text txt = new text(shell, swt.single);         txt.settext("text object");         txt.addverifylistener(new verifylistener(){                 public void verifytext(verifyevent event){                     event.doit = event.text.length() == 1 || character.isdigit(event.text.charat(0)); //set doit true if length of event.text (the text want put in) 1 or the first character digit.                 }             }         );          //table         final table table = new table(shell, swt.single | swt.border | swt.full_selection);         table.setheadervisible(true);         table.setlinesvisible(true);         tablecolumn column1 = new tablecolumn(table, swt.null);         column1.settext("name");         column1.pack();         tablecolumn column2 = new tablecolumn(table, swt.null);         column2.settext("age");         column2.pack();         tableitem item1 = new tableitem(table, swt.null);         item1.settext(new string[] {"dan", "43"});         tableitem item2 = new tableitem(table, swt.null);         item2.settext(new string[] {"john", "23"});         table.addselectionlistener(new selectionadapter() {             public void widgetselected(selectionevent event){                 tableitem[] selected = table.getselection();                 if (selected.length > 0){                     system.out.println("name: " + selected[0].gettext(0));                     system.out.println("age: " + selected[0].gettext(1));                 }             }          });          //tab folder         final tabfolder tabfolder = new tabfolder(shell, swt.border);         tabitem tabitem1 = new tabitem(tabfolder, swt.null);         tabitem1.settext("tab 1");         tabitem tabitem2 = new tabitem(tabfolder, swt.null);         tabitem2.settext("tab 2");          composite compo = new composite(tabfolder, swt.null);         tabitem2.setcontrol(compo);              //text hellotext = new text(shell, swt.center);         //hellotext.settext("hello swt");         //hellotext.pack();          shell.pack();         shell.open();          while(!shell.isdisposed()){             if (!display.readanddispatch())                 display.sleep();         }         display.dispose();       }  }

and here's error:

enter image description here


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