Erfan Banakar issues

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                                            Erfan Banakar

I get error on vagrant plugin install vagrant-vbguest

When i run command vagrant plugin install vagrant-vbguest i get bellow error ` nstalling the 'vagrant-vbguest' plugin. This can take a few minutes... /usr/lib/ruby/2.3.0/rubygems/specification.rb:949:in `all=': undefined method `group_by' for nil:NilClass...