Internal server error

http_handler_id `manual_file' does not exist
In:
[81] throw(error(existence_error(http_handler_id,manual_file),_5200))
[78] http_dispatch:http_link_to_id(manual_file,[],_5240) at /usr/lib/swi-prolog/library/http/http_dispatch.pl:575
[77] pldoc_man:dom_element(img,[src='broadcast.gif'],[],'/usr/lib/swi-prolog/doc/Manual/broadcast.html',_5278,_5280) at /usr/lib/swi-prolog/library/pldoc/doc_man.pl:1109
[75] pldoc_man:dom_list(pldoc_man:[...],'/usr/lib/swi-prolog/doc/Manual/broadcast.html',_5326,_5328) at /usr/lib/swi-prolog/library/pldoc/doc_man.pl:1069
[74] pldoc_man:dom_element(div,[style='text-align:center'],[element(img,...,[])],'/usr/lib/swi-prolog/doc/Manual/broadcast.html',[nl(1),<|...],_5380) at /usr/lib/swi-prolog/library/pldoc/doc_man.pl:1133
[72] pldoc_man:dom_list(pldoc_man:[...|...],'/usr/lib/swi-prolog/doc/Manual/broadcast.html',[nl(1),<|...],_5458) at /usr/lib/swi-prolog/library/pldoc/doc_man.pl:1069
[61] pldoc_man:dom_list(pldoc_man:[...],'/usr/lib/swi-prolog/doc/Manual/broadcast.html',['\n',...|...],_5522) at /usr/lib/swi-prolog/library/pldoc/doc_man.pl:1069
[57] pldoc_man:dom_list(pldoc_man:[...],'/usr/lib/swi-prolog/doc/Manual/broadcast.html',[nl(1),<|...],_5582) at /usr/lib/swi-prolog/library/pldoc/doc_man.pl:1069
[55] pldoc_man:man_matches_nt([... - ...],section(2,'A.4','sec:broadcast','/usr/lib/swi-prolog/doc/Manual/broadcast.html'),[],[nl(1),<|...],_5648) at /usr/lib/swi-prolog/library/pldoc/doc_man.pl:1023
[54] html_write:do_expand(\man_matches_nt(...,...,[]),pldoc_man,[nl(1),<|...],_5722) at /usr/lib/swi-prolog/library/http/html_write.pl:416
[53] html_write:html_expand(\man_matches_nt(...,...,[]),pldoc_man,[nl(1),<|...],_5786) at /usr/lib/swi-prolog/library/http/html_write.pl:395
[50] html_write:do_expand(class(navcontent)div\ ...,pldoc_man,[nl(1),<|...],_5850) at /usr/lib/swi-prolog/library/http/html_write.pl:468
[49] html_write:html_expand(class(navcontent)div\ ...,pldoc_man,[nl(1),<|...],_5916) at /usr/lib/swi-prolog/library/http/html_write.pl:395
[48] html_write:qhtml([...div...],pldoc_man,[nl(1),<|...],_5982) at /usr/lib/swi-prolog/library/http/html_write.pl:384
[43] html_write:do_expand('<garbage_collected>',pldoc_http,'<garbage_collected>',_6046) at /usr/lib/swi-prolog/library/http/html_write.pl:416
[42] html_write:html_expand(\man_page(...,[]),pldoc_http,[mailbox(head,...),...|...],_6082) at /usr/lib/swi-prolog/library/http/html_write.pl:395
[39] html_write:html_expand(pldoc_http: \ ...,cp_help,[mailbox(head,...),...|...],_6146) at /usr/lib/swi-prolog/library/http/html_write.pl:395
[36] html_write:do_expand('<garbage_collected>',cp_help,'<garbage_collected>',_6210) at /usr/lib/swi-prolog/library/http/html_write.pl:468
[35] html_write:html_expand(class(content)div(pldoc_http: ...),cp_help,[nl(1),<|...],_6246) at /usr/lib/swi-prolog/library/http/html_write.pl:395
[34] html_write:qhtml('<garbage_collected>',cp_help,'<garbage_collected>',_6314) at /usr/lib/swi-prolog/library/http/html_write.pl:384

Note: some frames are missing due to last-call optimization.
Re-run your program in debug mode (:- debug.) to get more detail.

SWI-Prolog httpd at vdeboer