A Task's exception(s) were not observed either by Waiting

What is this? I don’t understand!
I just push the “Play”

A Task’s exception(s) were not observed either by Waiting on the Task or accessing its Exception property. As a result, the unobserved exception was rethrown by the finalizer thread. (Not a directory : ‘/Applications/Lunacy.app/Contents/MacOS/Lunacy/Assets/Prototyping/style.css’)

Hey there,

Could you tell me your Lunacy and OS versions, please? If you could elaborate on the issue or send a screenshot/screencast it would be great too.