Unresolved specs during Gem::Specification.reset:

I was seeing this issue by just running RSpec on its own. From what I understand, this means that you have more than one version of the listed gems installed on your system, and RSpec is unsure which one to use. After uninstalling older version of the gems, the warnings went away.

You can try:

gem cleanup lumberjack

Or:

gem list lumberjack

gem uninstall lumberjack

If you're using Bundler, you can try bundle exec guard (or in my case bundle exec rspec).

Using the following command solved it for me:

bundle clean --force

See guard-and-unresolved-specs for more info

Use Bundler. Call bundle exec guard, not guard.