.htaccess - white page

hello. my vbulletin forum is not opened,white page. please help me
when i del RewriteEngine On and forum open but threads not open
and subdomains htaccess are RewriteEngine On

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 ^[^/]+f([0-9]+)(p([0-9]+))?\.html$ vbseo.php?vbseourl=forumdisplay.php&f=$1&page=$3 [L]
RewriteRule ^[^/]+t([0-9]+)(p([0-9]+))?\.html$ vbseo.php?vbseourl=showthread.php&t=$1&page=$3 [L]

# 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\.populyar\.net
RewriteRule (.*) http://www.populyar.net/$1 [R=301,L]

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


RewriteCond %{REQUEST_URI} !(admincp/|modcp/|cron|vbseo_sitemap)
RewriteRule ^((archive/)?(.*\.php(/.*)?))$ vbseo.php [L,QSA]

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

php_value display_errors on

RewriteCond %{HTTP_HOST} ^populyar.net$ [OR]
RewriteCond %{HTTP_HOST} ^www.populyar.net$
RewriteRule ^image\/?$ "http\:\/\/image2\.populyar\.net\/" [R=302,L]

vb 3.8.5 vbseo 3.3.0

I'm seeing:
Fatal error: Call to undefined function vbseo_requested_url() in /home/populyar/public_html/vbseo.php on line 18

Please try re-ftp'ing all the files and re-import the product again. It seems that your ftp transfer might not have completed correctly.

I transfer vbseo.php (same version 3.3.0 but i download today)

Brian Cummiskey thanks, everything is OK

Great! glad that was the fix