I am trying to install ROS on OS El Capitan by following instruction given on this link, https://gist.github.com/jmtatsch/3aa268d41ae40c89b35a but at line 80 I am getting following error

ERROR: the following packages/stacks could not have their rosdep keys resolved
to system dependencies:
roslisp: Missing resource geneus

What is the reason of this error and how to resolve it?