Friendly URLs is causing a problem

Here is the error I get when I try enabling friendly urls in Revolution.

The page isn’t redirecting properly:

Firefox has detected that the server is redirecting the request for this address in a way that will never complete.


* This problem can sometimes be caused by disabling or refusing to accept
cookies.

I am hosting this site on Rackspace if that matters. I followed the steps laid out in the documentation here: http://rtfm.modx.com/display/revolution20/Using+Friendly+URLs


Thanks!

found the answer. Or at least the solution.

instead of this line:

RewriteRule (.*) http://url.com/$1 [R=301,L]

I had to use:

RewriteRule ^(.*)/$ http://url.com/$1 [R=301,NC,L]