Error while trying to run

[sm7urw]

Hi!

Im trying to run your excellent ruby app but get a strange error;

/System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in require': cannot load such file -- bundler/setup (LoadError) from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in require'
from readinglist_to_instapaper.rb:3:in `

'

Any ideas what might be wrong?