# Error running tests - NameError: uninitialized constant

**URL:** <https://discuss.circleci.com/t/error-running-tests-nameerror-uninitialized-constant/18525>\
**Category:** Bug Reports\
**Tags:** ruby\
**Created:** [December 4, 2017, 1:02am UTC](https://discuss.circleci.com/t/error-running-tests-nameerror-uninitialized-constant/18525 "2017-12-04T01:02:09Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![mmarini](https://sea2.discourse-cdn.com/circleci/user_avatar/discuss.circleci.com/mmarini/32/17383_2.png) [@mmarini](https://discuss.circleci.com/u/mmarini)\
**Post date:** [December 4, 2017, 11:24pm UTC](https://discuss.circleci.com/t/error-running-tests-nameerror-uninitialized-constant/18525/2 "2017-12-04T23:24:49Z")

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It looks like this issue is related to the version of bundler on the ruby image. Following the steps posted to uninstall bundler 1.16 and re-installing bundler 1.15.4 has allowed the tests to run again

> [@\`bundle install\` stopped working today in 2.0 using circleci docker image](https://discuss.circleci.com/t/bundle-install-stopped-working-today-in-2-0-using-circleci-docker-image/18484):
>
> bundle install stopped working today. The fix we did was to upgrade bundler version to 1.16, cos 1.15 which is available was casing error /usr/local/bin/bundle:23:in `load': cannot load such file -- /usr/local/lib/ruby/gems/2.4.0/gems/bundler-1.16.0/exe/bundle (LoadError) I think it is connected with last circleci/ruby:2.4-node update made today. Can you confirm and fix that? Here is part of our config. version: 2 jobs: build: docker: - image: circleci/ruby:2.4-no…

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_[View the full topic](https://discuss.circleci.com/t/error-running-tests-nameerror-uninitialized-constant/18525)._