Revert "Fix & Use NotImplementedError."
Revert "Fix & Use NotImplementedError."

This reverts commit 4297b5eeb2540322f685ca858c37e422a6b79f1e.

dotandbo/spree,yomishra/pce,yomishra/pce,dotandbo/spree,dotandbo/spree,dotandbo/spree,yomishra/pce