Getting Error: FrozenError: can't modify frozen String when using with roda-sequel-stack

[backward-crazy-mage-puppy-36]

Hi,

I have cloned https://github.com/jeremyevans/roda-sequel-stack
and added roda_controller.rb at project root with the following code:

roda_controller.rb

class RodaController
attr_reader :request, :response

def initialize(request, response)
@request = request
@response = response
end

def respond_with(opts)
@responds_with ||= {}
@responds_with.merge!(opts)
end

def self.descendants
ObjectSpace.each_object(Class).select { |klass| klass < self }
end
end

I have also created a ./controllers/users_controller.rb with the following code:

class UsersController < RodaController
def index
"User Index"
end

def show(user_id)
"User Show ##{user_id}"
end
end

I have added to my app.rb:

configuring the plugin

plugin :controller, inject: ->{ [request, response] }

Dir["controllers/*.rb"].each { |file| require_relative file }

RodaController.descendants.each do |controller|
controller_key = Roda::RodaPlugins::Controller.underscore(controller.name)
controller_proc = -> (req, res) { controller.new(req, res) }

register_controller(controller_key, controller_proc)
end

When starting 'rackup' I get:
Error: FrozenError: can't modify frozen String: "UsersController"

Any help would be appreciated.