BRM API:authorized required to read the project

Dear Team,

I am trying to edit BRM decision Tables using BRM API.

I am getting the below runtime exception ,even after providing full access to the user for that BRM DC in NWA->Configuration->Security->Identity Management->Business Role Access Control->Select BRM DC->Select Role assigned to that user id->EDIT->DC Access Type: FULL->Save

Runtime Exception:

“User is not authorized to read the project”

Below is the code that I have written.

                try{

DefaultRulesEditAPIFactory apiInstance = DefaultRulesEditAPIFactory.getInstance();

      RulesEditAPI  api = apiInstance.getAPI();

      //Getting the Project    

       String projectName = "demo.com~myrules";

       IProject project = api.getProject(projectName);

}catch(Exception e)

      {

       wdComponentAPI.getMessageManager().reportException(""+e.getLocalizedMessage());

      }

Is there any access or authoriasyion missing to access the project

Regards,

Shamila S