Dear Reddy
Sap_bluecrystal is a new theme that supported only in the new LESS structure.
(that is the 404 reason)
In case you want to work with sap_bluecrystal you should set you laf configuration to work with LESS
See in that movie how to do it: https://www.youtube.com/watch?v=6KXh0RaFCDA
hope it helps you
Best Regards
Gadi