Cannot change monitor filename of channel

Hi folks!

I ´ve set TOUCH_MONITOR_FORMAT=auto${STRFTIME(${EPOCH},%C%y%m%d%H%M%S)}-${CALLERID(num)}-${ARG1}
to change the name of the file saved by automon but I get the following message:

No such format ‘autoTue Oct 27 10’
[Oct 27 10:32:47] WARNING[1946]: res_monitor.c:207 ast_monitor_start: Could not create file /var/spool/asterisk/monitor/auto-1256646767-1001-1003-in
[Oct 27 10:32:47] WARNING[1946]: res_monitor.c:402 ast_monitor_change_fname: Cannot change monitor filename of channel SIP/1003-08ef1740 to auto-1256646767-1001-1003, monitoring not started

Thanks for the help in advance!!!