title: Yii2 Rbac not able to add new roles
body: <p>In my Yii2 project previously I had worked on rbac, set it up as in the yii2 doc <a href="http://www.yiiframework.com/doc-2.0/guide-security-authorization.html" rel="nofollow noreferrer">click here</a>. Now I worked on different modules and I am back on rbac. Initially set it up with just sysadmin and staff. Now I want to add a new role along with the two previous roles. Which I did it auth_item table and assigned the user_id in the auth_assignmnet table to the new role created.</p>
  
  <p>In my controller added the role name for which actions he can access. But still throws Forbidden Exception. Tried different things but unable to work on it..</p>
  
  <p>Any solution for this?</p>