If you are attempting to build the dev setup for hypothes.is v0.8.14 and are receiving the error “OSError: [Errno 2] No such file or directory” whenever you request pages on the dev site, you need to install compass. sudo apt-get install ruby1.9.1-dev sudo gem install compass Hypothes.is v0.8.14 error: "OSError: [Errno 2] No such file or directory" was originally published by Martin Paul Eve at Martin Paul Eve on May 11, 2016.