Trying to register Bundler::GemfileError for status code 4 but Bundler::GemfileError is already registered

[justin]

If you got this error:

Trying to register Bundler::GemfileError for status code 4 but Bundler::GemfileError is already registered

The fix is to run:

gem update --system

Reference:

Trying to register Bundler::GemfileError for status code 4 but Bundler::GemfileError is already registered (3.1.2)

[bjpcjp]

Found this at exactly the right time - after reinstalling rbenv. TY.