Blade Flurry Disapear

Hi,
My blade Flurry is gone after learning the dual specc.
Changed from combat to subltety to configure and try it, and then when i swap to combat again, Blade flurry was gone from bars and spell book.

Did try to add a macro with the /cast blade flurry , but no joy.
The icon of blade flurry in macros menu, as disapear to.