Clara.io export to babylon

Hi I am new to Babylon and 3d modelling in general.

I manage to get the basics down. 

I am trying to export a basic model into babylon however

it never seems to initialize. I tried the same import file in

the babylon sandbox and get the same black scene with the 

loading circle.

My scene in clara.io is pretty simple, its an upside down

tetrahedron.

https://clara.io/view/2ee8381f-23f5-4eeb-b682-01e6f68f037d

I also tried exporting it to blend and I get some error.

Any ideas on what I could be doing wrong?

thanks

zak