using javafxpackager tool to build javaFX application on linux

II have a JDK1.7.0_10 installed on my ubuntu 12.04 machine , and I'm trying to build a very simple HelloWorld javafx application with the javafxpackager tool with the -makeall option , this argument option assume that all my source files in a src dir, I have on java file in the src dir called HelloWorld.java that contain one class HelloWorld in the default package name.
this is my project layout :

I'm in the same dir as src, usingthis command : and I have an error message :

anyone with javafxpackager experience can help me ? thanks