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Flycheck can't find rubocop executable

This is probably to do with using a version manager (e.g. rvm or asdf), and the fix might depend on which one you use. See https://github.com/flycheck/flycheck/issues/362 for more info.

Use flycheck-verify-setup to see which version of Ruby Spacemacs is using. Make sure rubocop is installed as a gem on that version.