Hello,
That’s not an error, that’s just warning. Anyway, the warning is not related to our theme because even with the default Storefront theme http://prntscr.com/q56ml3 and deactivated all the plugins http://prntscr.com/q56nu6 it still persists.
Regards
One standard license is valid only for 1 project. Running multiple projects on a single license is a copyright violation.