Unable to get API

Wiki has not provided enough info how to get API.
Using SpigotSiteAPI.getApi() returns null.

[Maximvdw]

have you initialized the spigot core - check the example projects https://github.com/Maximvdw/SpigotAutoSend/blob/master/src/main/java/be/maximvdw/spigotas/SpigotAutoSend.java