cant build javafx project

Java FX Packager: Can't build artifact - fx:deploy is not available in this JDK

Java FX Packager: Can't build artifact - fx:deploy is not available in this JDK

Java FX Packager: Can't build artifact - fx:deploy is not available in this JDK

Java FX Packager: Can't build artifact - fx:deploy is not available in this JDK
this is the error i get but i dont understand what fx:deploy is