I regularly receive the following error when trying to add a valid Sketch-based UI kit to my Lunacy library: “There are no Symbols in the file you’re trying to add”.
What could be the reason for this and how to fix the issue?
Thanks in advance!
The reason of such error can be that there are really no symbols in the UI kit 
As a rule, a kit you add to your library should contain symbols - if you are sure that it does, but the error appears anyway, please send us this the kit file so we can check it on our end.
Thank you!