Standard Hierarchy Error Message

Hi all,

I created a controlling area. Activated all the cost n profit centre elements through OKKP.

I also created a Cost Centre Group throught transaction KSH1.

Assigned a few cost centres too there in that hierarchy,

However, when i try to create cost centres throught transaction KS01, it says, Controlling area 1133 does not have a standard hierarchy. Please assign one.

Could anyone tell me how to resolve this..?