[SOLVED] ERROR: While executing gem ... (NoMethodError) undefined method `spec' for nil:NilClass

Issue

I'm trying to get started with ruby and Watir-webdriver for some test automation.

sudo apt-get install ruby rubygems

sudo gem install watir-webdriver

Whenever I gem install I'm getting these errors like :

[/usr/lib/ruby/gems/1.8/specifications/selenium-webdriver-2.13.0.gemspec] isn't a Gem::Specification (NilClass instead).
ERROR:  While executing gem ... (NoMethodError)
    undefined method `spec' for nil:NilClass

Solution

The problem was due to corrupted downloads being stored in the cache, so that even after gem uninstall and reinstall, the error persisted. To force re-download, I emptied the cache directories which are found by checking under GEM PATHS in the output of the command gem env.

Answered By - wim

Answer Checked By - Robin (WPSolving Admin)