Hello there!

I am having a problem with rewriterule,
None of this works, and I know the file htaccess works etc.. Can anyone help, I changed \ to / etc..
My htaccess
Options +FollowSymLinks
RewriteEngine On
RewriteRule ^cover-([0-9]+)/.html$ view.php?cover=$1
RewriteRule ^sendcover-([0-9]+)/.html$ send_cover.php?cover=$1
RewriteRule ^index\.html$ index.php
RewriteRule ^page-([0-9]+)/.html$ page.php?pid=$1
RewriteRule ^success\.html$ index.php?er=success
RewriteRule ^unknown-error/.html$ index.php?er=un_error
RewriteRule ^width/.html$ index.php?er=width
RewriteRule ^height/.html$ index.php?er=height