Uncaught Exception: Object->__call(): the method 'listmembers' does not exist on 'DNProject', or the method is not public

[zarocknz]

Trying to use the master branch of this project and get this error: [User Error] Uncaught Exception: Object->__call(): the method 'listmembers' does not exist on 'DNProject', or the method is not public When trying to see an overview of an environment in the front end.

I see lots of calls to this listmembers() function in the codebase but have not discovered where its supposed to be defined.

Can anyone shed some light on this?

Thanks.