c# - Adding a wizard to a blank project: "The operation could not be completed. No such interface supported" -

i've created custom wizard generates windows form through code lists out sql queries user. of testing of form , wizard itself, adding blank project bring form , test button click events , other general form stuff. fleshed out listbox's event listeners , ever since error:

googling has lead me lot of posts ruby, i'm not using. other suggestions reboot , re installation, , proved unsuccessful. attempted comment out listbox events did not keep error occuring, however, if helps here events in question:

//-----------event fired when listbox object double-clicked; populate listbox new databases---------     public void datalist_mousedoubleclick(object sender, eventargs e)     {         //temp string used hold name of clicked object         string selectedname = datalist.selecteditem.tostring();          firstsel.tablevar = selectedname;          foreach (tempdatavar t in datavars)         {             if (t.tablevar == firstsel.tablevar)             {                 firstsel = t;             }         }          string newq = "select column_name,* information_schema.columns table_name = '" + firstsel.tablevar + "' , table_schema= '" + firstsel.schemavar + "'";//order table_name'";          results = getdataset(bldr.tostring(), newq);          //listbox1.items.clear();          foreach (datarow row in results.tables[0].rows)         {             //foreach (object x in row.itemarray)             //{             //  listbox1.items.add(x.tostring());             //}              (int x = 0; x < row.itemarray.length; x++)             {                 if (x == 0)                 {                     collist.items.add(row.itemarray[x]);                 }             }         }          datalist.enabled = false;     }     //-----------------------------event fires when index of second listbox changes--------------------------     private void collist_selectedindexchanged(object sender, eventargs e)     {         btnyes.enabled = true;     } 

noobie mistake fixed co-worker! blindly copied , pasted following code "how make wizard tutorial":

[comvisible(true)] [guid("20184b81-7c38-4e02-a1e3-8d564eec2d25"), progid("mynewwizard.class1")] 

this code needed directly above mynewwizard class , accidentally pasted in custom tempdatavar class in white space between these lines , start of mynewwizard class. if you're receiving similar error i'd suggest testing around order of of attributes/classes!