Internal error, yaws code crashed

ERROR erlang  code  crashed:
 File: /var/yaws/psb/content.yaws:1
Reason: {{badmatch,{error,enoent}},
         [{m1,serve_mrss,2},
          {m1,file_entry,4},
          {m1,menu,3},
          {yaws_server,deliver_dyn_part,8},
          {yaws_server,aloop,3},
          {yaws_server,acceptor0,2},
          {proc_lib,init_p,5}]}
Req: {http_request,'GET',
                   {abs_path,"/content.yaws/mrss/Potsdamer-Schl%C3%83%C2%B6ssermarathon-11-Juni-2006"},
                   {1,1}}