R: [vqadmin] Problem with virtual hosts

Thanks for your email, John.

I've a problem now.
My steps for vh n.1 (in /var/www/htdocs directly)
1- "ScriptAlias /cgi-bin/" commented out
2- /var/www/htdocs/cgi-bin created
3- cp from /var/www/cgi-bin/vqadmin to /var/www/htdocs/cgi-bin/vqadmin;
chmod/chown ok
4- in vh n.1 added
<Location /cgi-bin/>
               Options +ExecCGI
</Location>
I've tryed too with

<Directory "/var/www/htdocs/cgi-bin">
               AllowOverride None
               Options +ExecCGI -Indexes
               Order allow,deny 
               Allow from all
</Directory>

But nothing, I've always the same error: 500, Internal Server Error.
And in error_log:
Premature end of script headers: /var/www/htdocs/cgi-bin/vqadmin/vqadmin.cgi

Where is my mistake?
Thanks for patience and support
Regards
Andrea