Erro Run and Compile

I am Newbie and got error
Waiting for debugger to connect...
java.lang.NoClassDefFoundError: javafx/scene/control/Dialog
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:259)
at anywheresoftware.b4a.shell.Shell.getCorrectClassName(Shell.java:504)
at anywheresoftware.b4a.shell.Shell.createObject(Shell.java:491)
at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:244)
at...

Erro Run and Compile

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