Hi Ben,
Sorry for taking so long to get back. I can tell you what the error means: the component is saying that the schedule for Outdoor Air (OA) is already in your openStudio library. So my guess something is going wrong in the download of the OpenStudio libraries that automatically happens when you drag and drop the HB component onto the canvas the first time.
What is your internet connection like on your machine? Is is stable? Is there a firewall or anything that could block your access to the site app.box?
There is a workaround for this if this is so. You will have to download the openstudio libraries here:
https://app.box.com/s/y2sx16k98g1lfd3r47zi
and then copy and paste them into a folder that you create in this location of your computer:
C:\ladybug\openstudio
If there is a folder there already, then delete it.
My guess is that something similar might be happening for Ladybug and the Radiance functions that it downloads and uses. I can give you more instructions if this first workaround helps.