How do I fix this error? safari, macos, rails 6, ruby 2.7 - following a stripe checkout tutorial. thank you.

How do I fix this error? safari, macos, rails 6, ruby 2.7 - following a stripe checkout tutorial. thank you.

It seems its not an error. moving on: does it make sense to ‘freeze’ all the packages at one version number (in the Gemfile) after creating a new rails app/site? Do people do that to avoid being bitten in the butt by updates?
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so far so good though, its all working