Internal server error 500

[reim]

I get the internal server error on my site's register page when my .htacess file doesn't have RewriteBase /

But if it does have it, then my register page doesn't load at all, and loads back to the home page no matter what link I click on the site!

Here is my .htaccess file:

php_flag display_errors off

# This controls what config options to use.
# SetEnv RELEASE_MODE DEV

RewriteEngine On
http://reim.altervista.org = /

# These are the real folders.
RewriteRule ^resources/(.*)$ resources/$1 [L]
RewriteRule ^docs/(.*)$ docs/$1 [L]

# Specific, prettier URLs.
RewriteRule ^profile/([0-9]+) index.php?page_slug=profile&user_id=$1 [NC,L]
RewriteRule ^pet/([0-9]+) index.php?page_slug=pet&pet_id=$1 [NC,L]
RewriteRule ^edit-pet/([0-9]+) index.php?page_slug=edit-pet&pet_id=$1 [NC,L]
RewriteRule ^shop/([0-9]+) index.php?page_slug=shop&shop_id=$1 [NC,L]
RewriteRule ^notice/([0-9]+) index.php?page_slug=notice&state=jump&notification _id=$1 [NC,L]

# Pagination for /items/ - /items is still handled by the catch-all, etc.
RewriteRule ^items/([0-9]+) index.php?page_slug=items&page=$1 [NC,L]
RewriteRule ^news/([0-9]+) index.php?page_slug=news&page=$1 [NC,L]
RewriteRule ^crafting/([0-9]+) index.php?page_slug=crafting&page=$1 [NC,L]

# Messages - first pagination. Then we have two URLs mapped to our write-new
# slug - /write-new-message/ and /write-message-reply/. -new accepts a user ID,
# and -reply takes a message ID. Slick.
RewriteRule ^messages/([0-9]+) index.php?page_slug=messages&page=$1 [NC,L]
RewriteRule ^write-new-message(/([0-9]+))? index.php?page_slug=write-message&to_user_id=$2 [NC,L]
RewriteRule ^write-message-reply(/([0-9]+))?(/(all))? index.php?page_slug=write-message&reply_to_id=$2&reply_to_all=$4 [NC,L]
RewriteRule ^message/([0-9]+) index.php?page_slug=message&message_id=$1 [NC,L]

# The boards need to support both a 'nice' URL (/thread/1) AND a page number
# on that URL (/thread/1/2/).
RewriteRule ^threads/([0-9]+)(/([0-9]+))? index.php?page_slug=threads&board_id=$1&page=$3 [NC,L]
RewriteRule ^thread/([0-9]+)(/([0-9]+))? index.php?page_slug=thread&thread_id=$1&page=$3 [NC,L]
RewriteRule ^edit-post/([0-9]+)(/([0-9]+))? index.php?page_slug=edit-post&post_id=$1&page=$3 [NC,L]
RewriteRule ^edit-thread/([0-9]+)(/([0-9]+))? index.php?page_slug=edit-thread&thread_id=$1&page=$3 [NC,L]

# Search page rules.
RewriteRule ^search/([a-z0-9]+)(((/([^/]+))(/(exact|contains)?)(/([0-9])+)?))? index.php?page_slug=search&state=search&search=$1& term=$5&page=$9&precision=$7 [NC,L]

# Craft things.
RewriteRule ^craft/([0-9]+) index.php?page_slug=craft&id=$1 [NC,L]

# Gotta catch 'em all! Don't put any rules below this one.
RewriteRule ^([A-Z0-9-]+)(/(.*))?$ index.php?page_slug=$1 [QSA,NC,L]


Apache directives:

RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_URI} !\.(js|css|gif|jpg|png|ico)$ [NC]
RewriteRule ^(.*)$ index.php [QSA,L]
RewriteRule ^get/([0-9]+).gif$ /click/siggy/$1 [L]
# # avhp5-engine
AddHandler av-php56 .php
php_flag display_errors off

# # av:Toolbar
SetEnv AV_TOOLBAR 0

[alemoppo]

http://forum.en.altervista.org/alter...html#post15151

Bye!