index page show 404 after htaccess redirection

My HTACCESS , please tell me what is error???

# WPhtc: Begin Custom htaccess
RewriteEngine On
RewriteCond %{QUERY_STRING} ^m=[01]$
RewriteBase /
RewriteRule ^([0-9]{4})/([0-9]{1,2})/([^/]+).html$ $1/$2/$3/ [QSA,R=301,L]
RedirectMatch 301 ^/([^/]+).html$ /$1

#ATOM Feeds
RewriteRule atom.xml feed/atom/ [L,R=301]
RewriteRule feeds/posts/default feed/atom/ [L,R=301]
#RSS FEEDS
RewriteRule feeds/posts/default?alt=rss feed/ [L,R=301]
RewriteRule rss.xml feed/ [L,R=301]
#Comments Feed
RewriteRule /feeds/comments/default comments/feed/ [L,R=301]
RewriteRule /feeds/comments/default?alt=rss comments/feed/ [L,R=301]
# WPhtc: End Custom htaccess

#Redirect archives
RewriteRule ^([0-9]{4})_([0-9]{1,2})_([0-9]{1,2})_archive.html$ $1/$2/ [L,R=301]
#Redirect labels/categories
RewriteRule ^search/label/(.*)$ category/$1/ [L,R=301]

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>

# END WordPress