ruby on railsERROR Could not fin

ruby on rails - ERROR: Could not find a valid gem 'buftok' (>= 0), here is why: - Stack Overflow
When I run my command ruby tweet.rb I get this error:SystemLibraryFrameworksRuby.frameworkVersion
ruby on railsERROR Could not find a valid gem 39buftok39 (gt 0)here is whyStack Overflow
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