404由于.htaccess文件而出错

我有一个网站。在这个网站上，我有一些404文件找不到错误，根据我的谷歌网站管理员，尽管所有的文件都存在。它们如下：

http://firstcovers.net/http//firstcovers.net/
http://firstcovers.net/category/1/http//firstcovers.net/
http://firstcovers.net/category/8/4/http//firstcovers.net/
http://firstcovers.net/category/17/2/http//firstcovers.net/
http://firstcovers.net/category/20/2/http//firstcovers.net/
http://firstcovers.net/facebook-cover/1317/privacy.php
http://firstcovers.net/facebook-cover/1317/terms.php
http://firstcovers.net/facebook-cover/1286/privacy.php
http://firstcovers.net/facebook-cover/338/terms.php

.htaccess文件的结构如下：

DirectoryIndex index.html.var index.htm index.html index.shtml index.xhtml index.wml index.perl index.pl index.plx index.ppl index.cgi index.jsp index.js index.jp index.php4 index.php3 index.php index.phtml default.htm default.html home.htm index.php5 Default.html Default.htm home.html
# Use PHP5 Single php.ini as default
#AddHandler fcgid-script .php
RewriteEngine On

RewriteRule ^latest.html /index.php?latest=y [L]
RewriteRule ^random.html /index.php?random=y [L]
RewriteRule ^showall.html /index.php?showall=y [L]
RewriteRule ^about.html /about.php [L]
RewriteRule ^userupload.html /userupload.php [L]
RewriteRule ^get-timeline.html /how.php [L]
RewriteRule ^facebook-cover-([0-9]+).html /detailpage.php?cp=$1 [L]
RewriteRule ^facebook-cover/([0-9]+)/([^/]*).html /detailpage.php?cp=$1 [L]
RewriteRule ^preview/([0-9]+)/([^/]*).html /detailpage.php?preview=y&cp=$1 [L]
RewriteRule ^category/([^/]*)/([^/]*).html /index.php?cat=$1 [L]
RewriteRule ^category/([^/]*)/([^/]*)/([^/]*).html /index.php?cat=$1&page=$2 [L]
RewriteRule ^cover-([0-9]+).html  /image.php?picID=$1 [L]
RewriteBase /
RewriteRule ^css/(.*'.css) /combine.php?type=css&files=$1
RewriteRule ^javascript/(.*'.js) /combine.php?type=javascript&files=$1
AddOutputFilterByType DEFLATE text/html text/plain text/xml text/css
<FilesMatch "''.(js|css|html|htm|php|xml)$">
# compress text, HTML, JavaScript, CSS, and XML
AddOutputFilterByType DEFLATE text/plain
AddOutputFilterByType DEFLATE text/html
AddOutputFilterByType DEFLATE text/xml
AddOutputFilterByType DEFLATE text/css
AddOutputFilterByType DEFLATE application/xml
AddOutputFilterByType DEFLATE application/xhtml+xml
AddOutputFilterByType DEFLATE application/rss+xml
AddOutputFilterByType DEFLATE application/javascript
AddOutputFilterByType DEFLATE application/x-javascript
# remove browser bugs
BrowserMatch ^Mozilla/4 gzip-only-text/html
BrowserMatch ^Mozilla/4'.0[678] no-gzip
BrowserMatch 'bMSIE !no-gzip !gzip-only-text/html
Header append Vary User-Agent
SetOutputFilter DEFLATE
</FilesMatch>
Header set Expires "Thu, 15 Apr 2030 20:00:00 GMT"
<IfModule mod_rewrite.c>
RewriteEngine on
RewriteCond %{HTTP_REFERER}     !^$
RewriteCond %{REQUEST_FILENAME} -f
RewriteCond %{REQUEST_FILENAME} .(gif|jpe?g?|png)$ [NC]
RewriteCond %{HTTP_REFERER}     !^https?://([^.]+.)?firstcovers. [NC]
RewriteRule .(gif|jpe?g?|png)$ - [F,NC,L]
</ifModule>
RewriteCond %{HTTP_REFERER} !^http://www.google.com/reader/view/.*$ [NC]
# Requires mod_expires to be enabled.
<IfModule mod_expires.c>
# Enable expirations
ExpiresActive On 
# Default directive
ExpiresDefault "access plus 1 month"
# My favicon
ExpiresByType image/x-icon "access plus 1 year"
# Images
ExpiresByType image/gif "access plus 1 month"
ExpiresByType image/png "access plus 1 month"
ExpiresByType image/jpg "access plus 1 month"
ExpiresByType image/jpeg "access plus 1 month"
# CSS
ExpiresByType text/css "access 1 month"
# Javascript
ExpiresByType application/javascript "access plus 1 year"
</IfModule>
FileETag MTime Size

我已尽力更改.htaccess文件的正则表达式。但我还是犯了一些错误。我无法追查那个错误。

我请求这个网站的成员帮助我。

**提前谢谢。

你的朋友。

V K锯。**