Multiple domains/ one server / .htaccess bug / 500

I m trying to have multiple domains in one server. I have created 3 folders (each for one domain) in publichtml folder plus .htaccess file, not sure why i get 500?

Here is the code for one of them (tavivat):

RewriteEngine On

RewriteCond %{HTTP_HOST} ^(www.) ?tavivat.com$ [NC]
RewriteCond %{REQUEST_URI} !^/tavivat/.*$
RewriteRule ^(.*)$* /tavivat/$1 [L]
RewriteRule . tavivat/index.html [L]

Thanks
Kayvan