Error when introducing SNS authentication

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Prepare for the introduction of SNS authentication by adding the following Gem

Do bundle install, set environment variables, etc. I got this error when I accessed localhost: 3000. ↓ ↓ ↓ ↓ ↓

Honestly

cannot load such file -- omniauth

I searched for a solution, but it didn't hit at all .. I checked both Gemfile and Gemfile.lock, but it doesn't seem to be a problem ..

So when you are in trouble

bundle update

Just typing this command worked fine in my environment.

What is bundle update?

A command that updates the part where the version does not mesh well when an error occurs when the version of Gem does not mesh well.

It seems that it is okay if you hit it for the time being

I hope it helps those who face similar errors.