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Bob Hensley26,421 Points
This looks to be an issue with readline. If you have readline installed, make sure you also have the development package installed. On YUM-based distros this would do it for ya:
yum install readline-devel
Daniel CardenasCourses Plus Student 9,236 Points
Same thing happened to me. Here's what worked for me.
I added the following code to my Gemfile:
And then I ran bundle in my terminal: treehouse:~/projects/treebook (master *) $ bundle
After that everything seemed to work.