Captive Portal /htdocs/errors/errorcode-413.html No such file or directory

[amalzz]

Hi Gents,
Need your valuable support...

After activated Captive Portal on opnsense 19.7.7. There is an error as bellows.
lighttpd [52515] (stat_cache.c.1033) lstat failed for :/htdocs/errors/errorcode-413.html No such file or directory

(response.c.447) request-size too long:2720 -> 413

Also the users can connect to the Captive Portal but after 5-10 minutes some users automatically disconnecting and popup the login page.

This is the second server I setup to monitor this error. The previous server itself given me the same error.

Cheers!