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Question

I'm using ruby on rails and I keep getting this error when using Rake commands. I tried to figure it out by googling and saw some stuff on updating rake or rspec versions causing problems. I tried but it didn't work and I'm not sure why I keep getting the error.

ruby version ruby 2.3.0p0

rails version Rails 4.2.6

rspec-rails 3.0

Answer 1

I tried specifying in the gemfile:

gem 'rspec-rails', '~> 3.4.4'

and

gem 'rspec-rails', '~> 3.3.0'

and after each one I did

bundle update
bundle install

and neither worked.

I ended up just removing the version part at the end:

gem 'rspec-rails'

And then did bundle update and it worked. My terminal showed:

Using rspec-rails 3.4.2

Answer 2

wspurgin's comment is the best answer. I tried doing

bundle update rspec

and

bundle update rspec-rails

and also

bundle update rspec-core

to no avail (ie. it did not get a newer version of the gems). When I tried specifying the required version 3.4.4 (according to google searches) of rspec-core I got

rspec-core (~> 3.4.4)

rspec-rails was resolved to 3.3.3, which depends on
  rspec-core (~> 3.3.0)

Therefore by updating rspec and rspec-rails together

bundle update rspec rspec-rails

It does the trick and gets the new versions.