Seph's Dynamic Enemies

[RPGKid64]

I keep getting this error.

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Nick's Project 3
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Script 'Dynamic Enemies' line 177: NoMethodError occurred.

undefined method `random' for -3..3:Range
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OK 
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I don't know a thing about Ruby so I don't know how to fix it. I need some help.

 

[Devon Jacobs]

Please list what Line 177 of the script is so we can figure it out please.

 

[SephirothSpawn]

At the bottom of the script, add this:

class Range
  def random
    a = self.to_a
    return a[rand(a.size)]
  end
end