Ruby on Rails resque task gets error

I'm trying to use resque in my ruby on rails application.

I created resque.rake file in lib/tasks folder

require 'resque/tasks'

task 'resque:setup' => :environment

I've started redis server by following line

redis-server /usr/local/etc/redis.conf

I have this RakeFile in my application:

require_relative 'config/application'

Rails.application.load_tasks

But when I run the following command to start rake

rake resque:work QUEUE='*'

I'm getting this error:

LoadError: cannot load such file -- resque/tasks

I can't see What I'm missing,

Any suggestions ?

Thanks.

Note: I'm using rails 5.0.1