Html 404错误页面的问题

我试图转到404错误页面：

以下是.htaccess文件：

Options +FollowSymLinks


RewriteEngine On
RewriteCond %{HTTP_HOST} ^www\.MYSITE\.co.uk [NC]
RewriteRule ^(.*)$ http://MYSITE.co.uk/$1 [R=301,L]

#enable hiding cfm extension
RewriteCond %{THE_REQUEST} \ /(.+/)?index(\.cfm)?(\?.*)?\  [NC]
RewriteRule ^(.+/)?index(\.cfm)?$ /%1 [R=301,L]

#RewriteCond %{ENV:REDIRECT_STATUS} ^$
#RewriteRule ^(.+)\.cfm$ /$1 [R=301,L]

RewriteCond %{SCRIPT_FILENAME}.html -f
RewriteRule [^/]$ %{REQUEST_URI}.cfm [QSA,L]

RewriteCond %{SCRIPT_FILENAME}.cfm -f
RewriteRule [^/]$ %{REQUEST_URI}.cfm [QSA,L]

ErrorDocument 404 /404.cfm

但是，它并不指向404.cfm页面

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有什么建议吗

它在做什么呢？它会打开通用服务器文件未找到屏幕