"Attribute OnAction is not allowed here" is what intelij says for the button

This line of code: <Button fx:id="DEBUG" OnAction="#DEBUG">DEBUG</Button> causes the "OnActtion" to be in red with an error message saying "Attribute OnAction is not allowed here" . If I ignore this error and try to run debug anyway I get this crash (see end of this message)

But the important line seems to be: Caused by: java.lang.IllegalArgumentException: Unable to coerce #DEBUG to interface javafx.event.EventHandler.

If I remove the OnAction attribute, the code compiles and runs perfectly, but of course there is no debugger hook, as the button does nothing in that case.

I am running debian with jdk1.8.0_101. "java -version" says java version "1.8.0_101"

Please help I am totally blocked.

Here is the crash I get if I try to debug with the onaction attribute, ignoring the error message:

/usr/local/lib/jvm/jdk1.8.0_101/bin/java -agentlib:jdwp=transport=dt_socket,address=127.0.0.1:40612,suspend=y,server=n -Dfile.encoding=UTF-8 -classpath /usr/local/lib/jvm/jdk1.8.0_101/jre/lib/charsets.jar:/usr/local/lib/jvm/jdk1.8.0_101/jre/lib/deploy.jar:/usr/local/lib/jvm/jdk1.8.0_101/jre/lib/ext/cldrdata.jar:/usr/local/lib/jvm/jdk1.8.0_101/jre/lib/ext/dnsns.jar:/usr/local/lib/jvm/jdk1.8.0_101/jre/lib/ext/jaccess.jar:/usr/local/lib/jvm/jdk1.8.0_101/jre/lib/ext/jfxrt.jar:/usr/local/lib/jvm/jdk1.8.0_101/jre/lib/ext/localedata.jar:/usr/local/lib/jvm/jdk1.8.0_101/jre/lib/ext/nashorn.jar:/usr/local/lib/jvm/jdk1.8.0_101/jre/lib/ext/sunec.jar:/usr/local/lib/jvm/jdk1.8.0_101/jre/lib/ext/sunjce_provider.jar:/usr/local/lib/jvm/jdk1.8.0_101/jre/lib/ext/sunpkcs11.jar:/usr/local/lib/jvm/jdk1.8.0_101/jre/lib/ext/zipfs.jar:/usr/local/lib/jvm/jdk1.8.0_101/jre/lib/javaws.jar:/usr/local/lib/jvm/jdk1.8.0_101/jre/lib/jce.jar:/usr/local/lib/jvm/jdk1.8.0_101/jre/lib/jfr.jar:/usr/local/lib/jvm/jdk1.8.0_101/jre/lib/jfxswt.jar:/usr/local/lib/jvm/jdk1.8.0_101/jre/lib/jsse.jar:/usr/local/lib/jvm/jdk1.8.0_101/jre/lib/management-agent.jar:/usr/local/lib/jvm/jdk1.8.0_101/jre/lib/plugin.jar:/usr/local/lib/jvm/jdk1.8.0_101/jre/lib/resources.jar:/usr/local/lib/jvm/jdk1.8.0_101/jre/lib/rt.jar:/home/pelliott-jessie-amd64/tmp/pomo/project/s3v1/out/production/Pomodoro:/home/pelliott/bin/intellij/idea-IC-162.2032.8/lib/idea_rt.jar com.teamtreehouse.pomodoro.Main Connected to the target VM, address: '127.0.0.1:40612', transport: 'socket' Exception in Application start method java.lang.reflect.InvocationTargetException at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:389) at com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:328) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:767) Caused by: java.lang.RuntimeException: Exception in Application start method at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:917) at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$155(LauncherImpl.java:182) at java.lang.Thread.run(Thread.java:745) Caused by: javafx.fxml.LoadException: /home/pelliott/tmp/pomo/project/s3v1/out/production/Pomodoro/fxml/home.fxml:15

at javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2601)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2579)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2441)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3214)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3175)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3148)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3124)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3104)
at javafx.fxml.FXMLLoader.load(FXMLLoader.java:3097)
at com.teamtreehouse.pomodoro.Main.start(Main.java:16)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$162(LauncherImpl.java:863)
at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$175(PlatformImpl.java:326)
at com.sun.javafx.application.PlatformImpl.lambda$null$173(PlatformImpl.java:295)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl.lambda$runLater$174(PlatformImpl.java:294)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
at com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
at com.sun.glass.ui.gtk.GtkApplication.lambda$null$49(GtkApplication.java:139)
... 1 more

Caused by: java.lang.IllegalArgumentException: Unable to coerce #DEBUG to interface javafx.event.EventHandler. at com.sun.javafx.fxml.BeanAdapter.coerce(BeanAdapter.java:496) at com.sun.javafx.fxml.BeanAdapter.put(BeanAdapter.java:258) at com.sun.javafx.fxml.BeanAdapter.put(BeanAdapter.java:54) at javafx.fxml.FXMLLoader$Element.applyProperty(FXMLLoader.java:512) at javafx.fxml.FXMLLoader$Element.processValue(FXMLLoader.java:363) at javafx.fxml.FXMLLoader$Element.processPropertyAttribute(FXMLLoader.java:325) at javafx.fxml.FXMLLoader$Element.processInstancePropertyAttributes(FXMLLoader.java:235) at javafx.fxml.FXMLLoader$ValueElement.processEndElement(FXMLLoader.java:767) at javafx.fxml.FXMLLoader.processEndElement(FXMLLoader.java:2823) at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2532) ... 17 more Exception running application com.teamtreehouse.pomodoro.Main Disconnected from the target VM, address: '127.0.0.1:40612', transport: 'socket'

Process finished with exit code 1