I'm not really a Mac user, but for curiosity I tried to find a solution. I see that there is software incompatibility with a specific version of OS X. The main part of the solution is a software update. Of the many subsequent answers, it seems correct to me:
gem uninstall therubyracer gem install therubyracer -v '0.12.2'
On my Ubuntu system, I use NodeJS as the javascript runtime. I suggest using it if possible.
Hope this helps!
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