Strange error

I got this error at exercise 3:
/home/ccuser/.gem/ruby/2.3.0/gems/activesupport-4.1.1/lib/active_support/values/time_zone.rb:285: warning: circular argument reference - now
Help please.
Or it’s just Safari.

Yeah, I got those ones too, looking around the internet, is seems to be a conflict with the ruby version and rails, but for me it works when I did the solution or restarted the exercise.

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Yes, but what if I get this error in a real app ?

Well, that depends on how you want to handle errors in a production environment, some people log error to a server specifically designed for logs, other has a service where users can add bugs and issues, other kills the page entirely and logs a message that something went wrong, and tells the user to send an email with a specific string that tells the developer what went wrong, most have a mix of all of the above.

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