Testing new Worldcon GoH template. What the heck am I doing wrong?

{{succession box | before=Algis Budrys
Michael Moorcock
Don Maitz
Roy Tackett | title=Worldcon
with
Milton A. Rothman
Stanley Schmidt
Michael Whelan | years=[[1998
56th_World_Science_Fiction_Convention | after=George Turner
Greg Benford
Bruce Gillespie }}

(this example would appear on the page C.J. Cherryh