Visual COBOL parameter mismatch


I am working on visual cobol with below three components:

1. cobol  managed code.

2. wrapper class program

3. .net application.

currently i am trying to invoke a method available in cobol from .NET with the help of wrapper  class, but i am facing a error of parameter mismatch as the  cobol dll contains method parameters of  'microfocus.cobol.program.reference' whereas .NET variables are of native .NET types .

Please let me know how can i resolve this.