Sitemap error

Hi to all, I have a problem creating sitemap.
When I click on RUN SITEMAP GENERATOR
an error incurred.

I submit 2 pics showing what appear.

some one have an idea about my problem?

Thanks and sorry for my bad english

my site is
LePedaneVibranti Forum - Powered by vBulletin

Please check this: vBSEO Sitemap Update with 3.2.0 Release Candidates

Thanks!!
changed and no error.
But now a question?

if I click on link

http://www.lepedanevibranti.it/forum...p_index.xml.gz

open vbseo_getsitemap.php and in there is nothing.

how google can read the url list?

thanks Oleg you are very Kind. Thank!!!
Fulvio

What is your .htaccess file contents in forum folder?

This is my .htaccess in www.lepedanevibranti.it/forum

Code:

# Comment the following line (add '#' at the beginning)
# to disable mod_rewrite functions.
# Please note: you still need to disable the hack in
# the vBSEO control panel to stop url rewrites.
RewriteEngine On
RewriteRule viewtopic\.php http://www.lepedanevibranti.it/forum/ [L,R=301]

# Some servers require the Rewritebase directive to be
# enabled (remove '#' at the beginning to activate)
# Please note: when enabled, you must include the path
# to your root vB folder (i.e. RewriteBase /forums/)
#RewriteBase /

#RewriteCond %{HTTP_HOST} !^www\.yourdomain\.com
#RewriteRule (.*) http://www.lepedanevibranti.it/forum/$1 [L,R=301]


RewriteRule ^((urllist|sitemap_).*\.(xml|txt)(\.gz)?)$ forum/vbseo_sitemap/vbseo_getsitemap.php?sitemap=$1 [L]

RewriteCond %{QUERY_STRING} !vbseourl=
RewriteCond %{REQUEST_URI} !(admincp/|modcp/|chat|cron)
RewriteRule ^(.*\.php(/.*)?)$ forum/vbseo.php?vbseourl=$1 [L,QSA]

RewriteCond %{REQUEST_FILENAME} !\.(jpg|gif)$
RewriteRule ^(archive/.*)$ vbseo.php?vbseourl=$1 [L,QSA]

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !^(admincp|modcp|clientscript|cpstyles|images)/
RewriteRule ^(.+)$ vbseo.php?vbseourl=$1 [L,QSA]

Thanks
ciao

Sitemap rewrite rule should be:

Code:

RewriteRule ^((urllist|sitemap_).*\.(xml|txt)(\.gz)?)$ vbseo_sitemap/vbseo_getsitemap.php?sitemap=$1 [L]

Very very thanks!!!!!!
now go very well!!
thanks oleg
have a nice day

Fulvio