[irrtoolset]Error: badly formed AS_path filter

I'm not sure what I'm missing here. When I pass the following through RtConfig, I get the above error. As per the man pages, RFC2622 states: "An AS-path regular expression can be used as a policy filter by enclosing the expression in ‘<’ and ‘>’. An AS-path policy filter matches the set of routes which traverses a sequence of ASes matched by the AS-path regular expression." I read that as meaning that my RtConfig line which reads @RtConfig aspath_access_list filter <AS577> should work fine. I'm using 577 as an example just to test things out. I'm not peering with 577 and have no relationship with them, however that shouldn't prevent me from being able to generate an as-path access-list using their information, should it?