Why does the call to getFactType() method returns null ?

Issue

• I have a clean install of JBoss Enteprise BRMS Platform 5.2 with the sample Mortgage facts and rules installed. I am attempting to run a test application that will instantiate a FactType instance of the LoanApplication Fact Model, where the Fact Model is stored in the mortgages package under MortgageModel -> LoanApplication. The issue is with the following piece of code where my call to getFactType() is returning null:

    FactType loanApplicationType = kbase.getFactType("mortgages", "MortgageModel.LoanApplication");

Meanwhile, at the server console the following WARN message is appearing:

        WARN  [RepositoryServlet] Unable to authenticate for rest api: null

Can you please explain how to resolve this issue?