ORM CFC Generator error

Hi

I'm trying to get Coldfusion Builder's ORM CFC Generator to build my cfcs but when I click the Generate button after setting my table relationships I get the following error:

Error : Event handler exception.. coldfusion.runtime.CfJspPage$ParameterNotFoundException: The required parameter SESSION.ORMTABLES was not provided.

I have an Application.cfc with sessionManagement=true, name is set, ormenabled is true and ormsettings specs a database.

What am I missing?

Thanks,

Rich