autoclasstree could not import C++ class with Breathe

[rvkennedy]

This may be more of a Breathe than a Mermaid issue. I can't get autoclasstree to recognize my doxygen-documented C++ classes. Is there a workaround for this or some way I can diagnose how the modules are named from mermaid's perspective?

For example:

.. autoclasstree:: avs::IOInterface

produces

Could not import avs::IOInterface (exception: No module named 'avs::IOInterface')

Apologies if this is not really a sphinxcontrib-mermaid issue.