Ruby “live” within LayOut is not ready for primetime.
There are no Layout module functions, no UI module loaded, and in fact the Ruby base load paths are incorrect for the LayOut installation and would need to be corrected in order to simply load standard libraries such as JSON. In addition the Sketchup module is empty and so no way to load RBS or RBE files.
It was a “booboo” that the Ruby Console is even loaded at this time.