adding policies

[Juan Pablo L.]

                                                                                Hi, i m trying to enabled policies in my AAA, but i m getting the following error:

Thu Apr 30 13:02:22 2015 : Error: ~/etc/raddb/policy.d/filter[66]: Failed to find "reject" as a module or policy.
Thu
 Apr 30 13:02:22 2015 : Error: ~/etc/raddb/policy.d/filter[66]: Please 
verify that the configuration exists in ~/etc/raddb/mods-enabled/reject.
Thu Apr 30 13:02:22 2015 : Error: ~/etc/raddb/policy.d/filter[66]: Failed to parse "reject" entry.
Thu Apr 30 13:02:22 2015 : Error: ~/etc/raddb/policy.d/filter[65]: Failed to parse "if" subsection.
Thu Apr 30 13:02:22 2015 : Error: ~/etc/raddb/sites-enabled/default[220]: Errors parsing authorize section.

i have enabled policies in radius.conf:
policy {
        $INCLUDE policy.d/
}

i have defined the policy in the
~/etc/raddb/policy.d/filter
filter_username {
        if (User-Name != "%{tolower:%{User-Name}}") {
                reject
        }
}

and i configured sites-available/default to call the policy in the authorize section by simply 
calling the name of the filter:

filter_username


but i get the above error, i would appreciate where to look for more info about this. thanks!!