Caused by: java.lang.IllegalAccessException: class com.sun.javafx.application.LauncherImpl (in module javafx.graphics)

Caused by: java.lang.IllegalAccessException: class com.sun.javafx.application.LauncherImpl (in module javafx.graphics)


SOLUÇÃO
 exports org.demo;
Colocar este comando no final do arquivo module.

module SEU_APLICATIVO {
    requires javafx.swt;
    requires javafx.base;
    requires javafx.controls;
    requires javafx.fxml;
    requires javafx.graphics;
    requires javafx.media;
    requires javafx.swing;
    requires javafx.web;
    exports org.demo;
}