How i can define an initiator of a process?

Hi,

i have configured the local configuration of a process.In this configuration i have assigned the user walter.bates into the authentication part, and in the actor filter part , i have created an initiator. The problem is that, when i have launched the process from bonita local, automatically it appears a page with this following message :

Acceso denegado: Ud no tiene los permisos para ver esta página.

I don't know what could be.

Regards