"unhandled and unrecoverable error" on /admin/model/voter

[ijt]

I'm working through the Evening with Chicago Boss tutorial
https://github.com/ChicagoBoss/ChicagoBoss/wiki/An-Evening-With-Chicago-Boss

When I visit http://localhost:8001/admin/model/voter, as the tutorial suggests, this error shows up in the browser:

An unhandled and unrecoverable error occurred. Please check error logs.

The error logs have this to say:

14:08:13.057 [notice] ApplicationForPath cb_admin
14:08:13.058 [info] Route: "/model/voter"Url
[]
14:08:13.059 [error] Unhandled Error: error:function_clause Stacktrace: [{string,tokens1,[49,"/",[]],[{file,"string.erl"},{line,226}]},{cb_admin_lib,-require_ip_address/1-fun-0-,3,[{file,"/Users/issactrotts/erlang/evening/deps/cb_admin/src/lib/cb_admin_lib.erl"},{line,24}]},{lists,foldr,3,[{file,"lists.erl"},{line,1274}]},{cb_admin_lib,require_ip_address,1,[{file,"/Users/issactrotts/erlang/evening/deps/cb_admin/src/lib/cb_admin_lib.erl"},{line,22}]},{boss_controller_adapter_pmod,before_filter,2,[{file,"src/boss/controller_adapters/boss_controller_adapter_pmod.erl"},{line,58}]},{boss_web_controller,apply_before_filters,3,[{file,"src/boss/boss_web_controller.erl"},{line,365}]},{boss_web_controller,apply_action,4,[{file,"src/boss/boss_web_controller.erl"},{line,300}]},{boss_web_controller,execute_action_inner,9,[{file,"src/boss/boss_web_controller.erl"},{line,287}]}]

The error message is cryptic. I tried pasting it into the erl shell, but it can't digest the dash (-) in -require_ip_address.