Cannot resolve file, with NTLM auth


we’re now using NTLM authentification on RT3.8.8
On user side everything works fine, but in the logs, i have the following
line written four times each time a page is displayed

[Mon Jun 6 11:48:24 2011] [warning]: [Mason] Cannot resolve file to
component: /var/www/error/HTTP_UNAUTHORIZED.html.var (is file outside
component root?) at
/usr/lib/perl5/vendor_perl/5.10.0/HTML/Mason/ line 853.

For sure this file is “outside component root” as defined in my rt3.conf :
DocumentRoot /opt/rt3/share/html

May i need to add more options in rt3.conf or modify others in httpd.conf

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