Ruby on Rails

I am creating my first app , a warning appeared " dl is deprecated
please use fiddle " knowing that I a beginner , I dont know how to solve
this problem. I am running ruby 2.1.5p273 , rails 4.1.8 ,gem 2.2.2
I thought I am having a problem with installation of ruby on rails on
windows.
pleaze is there any help for this ?

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