ng g app test

is failing inside of my nx workspace with an empty Error message:

Generating a lib via ng g lib test runs successfully, as does all of the standard angular cli commands when targeting an existing application. Creating a new nx workspace and running the ng g app ... command works fine, so I'm expecting this is something to do with the project itself.

I'm running nx & schematics 0.9.1, angular cli 1.7.3.

Happy to provide any other information, but unsure of where to look due to the lack of an error message.