当我在url或任意url中输入www.example.com/qqqqqq（考虑example.com是我的域名）时，它应该显示404错误，但它显示500内部服务器错误。 这是我的.htaccess文件，请帮帮我。
Options All -Indexes
RewriteEngine on
RewriteCond %{HTTP_HOST} ^example.com [NC]
RewriteRule ^(.*)$ http://www.example.com/$1 [L,R=301,NC]
RewriteRule ^product-([0-9a-zA-Z]+) p.php?en=$1 [NC,L]
RewriteRule ^category/([0-9a-zA-Z]+) as.php?en=$1 [NC,L]
RewriteCond %{REQUEST_FILENAME}.php -f
RewriteCond %{REQUEST_URI} !/$
RewriteRule ^(.*)$ $1\.php
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ $1.html [L]
#Error Pages
ErrorDocument 404 /404.php
#gzip compression
<ifModule mod_gzip.c>
mod_gzip_on Yes
mod_gzip_dechunk Yes
mod_gzip_item_include file .(html?|txt|css|js|php|pl)$
mod_gzip_item_include handler ^cgi-script$
mod_gzip_item_include mime ^text/.*
mod_gzip_item_include mime ^application/x-javascript.*
mod_gzip_item_exclude mime ^image/.*
mod_gzip_item_exclude rspheader ^Content-Encoding:.*gzip.*
</ifModule>
这是.htaccess文件，请帮帮我404.php