Error encountered; please report this error to a wizard.

Error was: E_PROPNF (Property not found); value: 0

VerbLoc:VerbProgrammerThisPlayerLine
#2945:text #789#2945#722210
#9:description #55#2945#72222
#2:www_description #789#2945#722212
#2:tell_www_body #60#2945#72222
#5:tell_www_body #60#2945#72221
#9:tell_www_body #789#2945#72222
#155:tell_www_body #789#2945#72227
#2:tell_www_page #789#2945#722213
#80:serve_page #789#80#722242
#81:do_GET #55#7222#722212
#81:do_null_command #55#7222#72229
#80:do_null_command #789#80#72221

You can cut-and-paste the following:

#2945:text (this == #2945), line 10: Property not found
... called from #9:description (this == #2945), line 2
... called from #2:www_description (this == #2945), line 12
... called from #2:tell_www_body (this == #2945), line 2
... called from #5:tell_www_body (this == #2945), line 1
... called from #9:tell_www_body (this == #2945), line 2
... called from #155:tell_www_body (this == #2945), line 7
... called from #2:tell_www_page (this == #2945), line 13
... called from #80:serve_page (this == #80), line 42
... called from #81:do_GET (this == #7222), line 12
... called from #81:do_null_command (this == #7222), line 9
... called from #80:do_null_command (this == #80), line 1
(end of traceback)