FOR VERSION 3.0.9 OR EARLIER ONLY
If you are using Cloud Typography, you are facing comma seperated fontnames for example: 'Gotham A', 'Gotham B'.
It's supported by semplice but if you enter the name as above it will lead to an error. The correct way to implement the name is to get rid of the single quotes and the space after the comma. In this example the right name would be:
Gotham A,Gotham B