Java Programming

Hi guys,
I've a strange issue.
I found some solutions on google and on this forum, but they doesn't work for me.
I've a javafx application in netbeans in which I also use swing controls.
I created a custom jlabel control

public class Label extends JLabel {

    public Label()
    {
    }

    private void setAspect(String csFontName, int nSizeFont, boolean bold,Color cColor)
    {
        int style=bold ? Font.BOLD : Font.PLAIN;
        this.setFont(new Font(csFontName,style,nSizeFont));
        this.setForeground(cColor);
    }

    public Label(String csText)
    {
        super(csText);
        setAspect("Tahoma",10,false,Color.black);

    }

    public Label(String csText, int nSize)
    {
        super(csText);
        setAspect("Tahoma",nSize,false,Color.black);

    }

    public Label(String csText, int nSize, boolean bold)
    {
        super(csText);
        setAspect("Tahoma",10,bold,Color.black);
    }

    public Label(String csText, int nSize, boolean bold, Color cColor)
    {
        super(csText);
        setAspect("Tahoma",10,bold,Color.black);
    }
}

I selected Label.java file in the project and I click on Tools->add to palette and I selected Swing controls as family.
I restarted netbeans and I found it in the palette.
I try to drag it into my swing form and I've :

Cannot load component class <ProjectName>.Label from project: D:\Progetti\<ProjectName>.
The class must be compiled and must be on the classpath of the project to which this form belongs.

Following forums I went on netbeans log

org.openide.ErrorManager$AnnException: msg
	at org.openide.ErrorManager$AnnException.findOrCreate(ErrorManager.java:870)
	at org.openide.ErrorManager$DelegatingErrorManager.annotate(ErrorManager.java:653)
....
....
Caused by: java.lang.ClassNotFoundException: <ProjectName>.Label
	at org.netbeans.modules.form.project.ProjectClassLoader.findClass(ProjectClassLoader.java:178)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
	at org.netbeans.modules.form.project.FormClassLoader.findClass(FormClassLoader.java:83)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:247)
	at org.netbeans.modules.form.project.ClassPathUtils.loadClass(ClassPathUtils.java:98)
	at org.netbeans.modules.form.MetaComponentCreator.prepareClass0(MetaComponentCreator.java:1322)
	... 34 more
msg
Cannot load component class ortholab2.Label from project: D:\Progetti\<ProjectName>.
The class must be compiled and must be on the classpath of the project to which this form belongs.

I hope someone can help me ,
Thanks