Children of the guardian phaser (#512)

Error encountered; please report this error to a wizard.

VerbLoc:Verb	Programmer	This	Player	Line
#84:children_table	#60	#84	#7131	5
#84:tell_children	#60	#84	#7131	6
#2:www_setup	#60	#512	#7131	3
#2:tell_www_page	#789	#512	#7131	11
#80:serve_page	#789	#80	#7131	42
#81:do_GET	#55	#7131	#7131	12
#81:do_null_command	#55	#7131	#7131	9
#80:do_null_command	#789	#80	#7131	1

You can cut-and-paste the following:

#84:children_table (this == #84), line 5: Property not found
... called from #84:tell_children (this == #84), line 6
... called from #2:www_setup (this == #512), line 3
... called from #2:tell_www_page (this == #512), line 11
... called from #80:serve_page (this == #80), line 42
... called from #81:do_GET (this == #7131), line 12
... called from #81:do_null_command (this == #7131), line 9
... called from #80:do_null_command (this == #80), line 1
(end of traceback)