html format

Did anybody experienced this error 
Internal server error

format_character `j' does not exist
In:
what follows is format argument, which if pasted is perfectly displayable, but the format still finds something wrong, I can not find any "\" in the argument

here is pertinent portion of stack
[21] format(...,[])
[19] doit('<garbage_collected>') at /Users/joseffrydl/Desktop/proKatu/praveTed/doprdele.pl:227
[18] http_dispatch:call_action(user:doit,[...|...]) at /opt/local/lib/swipl-6.5.2/library/http/http_dispatch.pl:594
[16] time:run_alarm_goal('<garbage_collected>','<garbage_collected>') at /opt/local/lib/swipl-6.5.2/library/time.pl:123
[15] setup_call_catcher_cleanup(time: ...,time: ...,_G1553,time: ...) at /opt/local/lib/swipl-6.5.2/boot/init.pl:310
[8] httpd_wrapper:call_handler('<garbage_collected>',9,'<garbage_collected>') at /opt/local/lib/swipl-6.5.2/library/http/http_wrapper.pl:257
[7] catch(httpd_wrapper: ...,error(...,...),httpd_wrapper:true) at /opt/local/lib/swipl-6.5.2/boot/init.pl:274
[6] httpd_wrapper:handler_with_output_to(user:http_dispatch,9,'<garbage_collected>',current_output,error(...,...)) at /opt/local/lib/swipl-6.5.2/library/http/http_wrapper.pl:237
[5] httpd_wrapper:handler_with_output_to('<garbage_collected>',9,'<garbage_collected>',<stream>(0x1805590),error(...,...)) at /opt/local/lib/swipl-6.5.2/library/http/http_wrapper.pl:247
[4] httpd_wrapper:http_wrapper('<garbage_collected>',<stream>(0x1805160),<stream>(0x1805230),_G1668,'<garbage_collected>') at /opt/local/lib/swipl-6.5.2/library/http/http_wrapper.pl:89
[3] thread_httpd:http_process('<garbage_collected>',<stream>(0x1805160),<stream>(0x1805230),'<garbage_collected>') at /opt/local/lib/swipl-6.5.2/library/http/thread_httpd.pl:549
[2] catch(thread_httpd: ...,_G1700,thread_httpd:true) at /opt/local/lib/swipl-6.5.2/boot/init.pl:274
[1] thread_httpd:http_worker([...|...]) at /opt/local/lib/swipl-6.5.2/library/http/thread_httpd.pl:382
[0] <meta call>

Thanks Josef Frydl

-------------- next part --------------
HTML attachment scrubbed and removed