It shows this in the log file... any ideas

at /usr/lib/x86_64-linux-gnu/perl5/5.36/YAML/XS.pm line 136.: /usr/share/koha/intranet/cgi-bin/errors/500.pl, referer: http://10.1.157.114:8001/cgi-bin/koha/admin/branches.pl
[Thu Feb 15 15:23:24.107675 2024] [cgi:error] [pid 102045] [client 10.5.87.198:53133] End of script output before headers: 500.pl, referer: http://10.1.157.114:8001/cgi-bin/koha/admin/branches.pl
maintenance@Koha-Library:/etc/apache2/sites-available$