[wtr-general] My NetBeans doesn't recognize watir saying: "no such file to load -- watir"

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I want to make the automation process so I downloaded Ruby and invoked "gem
install watir" on the cmd and it shows watir is installed.
I installed the proper plugin:
Ruby and Rails - plugin
when i wrote

require 'watir'
browser = Watir::Browser.new:chrome

and run th file, the result is:

LoadError: no such file to load -- watir
require at org/jruby/RubyKernel.java:1027
require at
C:/Users/Acer/AppData/Roaming/NetBeans/8.2/jruby/lib/ruby/shared/rubygems/custom_require.rb:36
(root) at
C:\Users\Acer\Documents\NetBeansProjects\RubyBasics\lib\main.rb:3


I tried to do the same using interactive Ruby and it worked, that shows my
ruby and watir automates but Netbeans doesn't recognize the file.

Help please.
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