Error encountered; please report this error to a wizard.

VerbLoc:Verb	Programmer	This	Player	Line
#0:do_bf_call	#60	#0	#8900	5
#104:bf_toobj	#55	#0	#8900	2
#101:bf_toobj	#60	#0	#8900	10
#47:www_read	#61	#47	#8900	22
#46:tell_www_body	#61	#1902	#8900	15
#2:tell_www_page	#789	#1902	#8900	13
#80:serve_page	#789	#80	#8900	42
#81:do_GET	#55	#8900	#8900	12
#81:do_null_command	#55	#8900	#8900	9
#80:do_null_command	#789	#80	#8900	1

You can cut-and-paste the following:

#0:do_bf_call (this == #0), line 5: Type mismatch
... called from #104:bf_toobj (this == #0), line 2
... called from #101:bf_toobj (this == #0), line 10
... called from #47:www_read (this == #47), line 22
... called from #46:tell_www_body (this == #1902), line 15
... called from #2:tell_www_page (this == #1902), line 13
... called from #80:serve_page (this == #80), line 42
... called from #81:do_GET (this == #8900), line 12
... called from #81:do_null_command (this == #8900), line 9
... called from #80:do_null_command (this == #80), line 1
(end of traceback)