Mod Rewrite rule is not working

I have found mod rewrite problem at godaddy server.
page not found error when "tag" word using in url.
below are the rules

RewriteRule ^tag/(.*).html$ tag.php?url=$1
RewriteRule ^tag1/(.*).html$ tag.php?url=$1

I have checked these rules at here

http://www.smsjokesguru.com/tag/test.html
Result - page not found

http://www.smsjokesguru.com/tag1/test.html
Result - working ok

please suggest where is the problem.

Thanks

 

What's the whole of your .htaccess?

Do you have a RewriteBase line, if not try adding RewriteBase / after RewriteEngine on