The error I'm getting with AquaFX when using the Visual Designer:
Program started.
Nov 20, 2015 1:53:33 PM javafx.scene.control.Control loadSkinClass
SEVERE: Failed to load skin 'com.aquafx_project.controls.skin.AquaTabPaneSkin' for control TabPane@56a136aa[styleClass=tab-pane]
java.lang.NoSuchMethodError: com.sun.javafx.scene.traversal.TraversalEngine.<init>(Ljavafx/scene/Parent;Z)V
at com.aquafx_project.controls.skin.rt21682.TabPaneSkinHack$TabContentRegion$4.<init>(TabPaneSkinHack.java:1527)
at com.aquafx_project.controls.skin.rt21682.TabPaneSkinHack$TabContentRegion.<init>(TabPaneSkinHack.java:1527)
at com.aquafx_project.controls.skin.rt21682.TabPaneSkinHack.addTabContent(TabPaneSkinHack.java:370)
at com.aquafx_project.controls.skin.rt21682.TabPaneSkinHack.<init>(TabPaneSkinHack.java:191)
at com.aquafx_project.controls.skin.AquaTabPaneSkin.<init>(AquaTabPaneSkin.java:20)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:422)
at javafx.scene.control.Control.loadSkinClass(Control.java:722)
at javafx.scene.control.Control$4.invalidated(Control.java:659)
at javafx.beans.property.StringPropertyBase.markInvalid(StringPropertyBase.java:109)
at javafx.beans.property.StringPropertyBase.set(StringPropertyBase.java:144)
at javafx.css.StyleableStringProperty.set(StyleableStringProperty.java:83)
at javafx.scene.control.Control$4.set(Control.java:651)
at javafx.css.StyleableStringProperty.applyStyle(StyleableStringProperty.java:69)
at javafx.css.StyleableStringProperty.applyStyle(StyleableStringProperty.java:45)
at javafx.scene.CssStyleHelper.transitionToState(CssStyleHelper.java:774)
at javafx.scene.Node.impl_processCSS(Node.java:9189)
at javafx.scene.Parent.impl_processCSS(Parent.java:1241)
at javafx.scene.control.Control.impl_processCSS(Control.java:855)
at javafx.scene.Parent.impl_processCSS(Parent.java:1272)
at javafx.scene.Node.processCSS(Node.java:9056)
at javafx.scene.Scene.doCSSPass(Scene.java:545)
at javafx.scene.Scene.preferredSize(Scene.java:1643)
at javafx.scene.Scene.impl_preferredSize(Scene.java:1720)
at javafx.stage.Window$9.invalidated(Window.java:846)
at javafx.beans.property.BooleanPropertyBase.markInvalid(BooleanPropertyBase.java:109)
at javafx.beans.property.BooleanPropertyBase.set(BooleanPropertyBase.java:144)
at javafx.stage.Window.setShowing(Window.java:922)
at javafx.stage.Window.show(Window.java:937)
at javafx.stage.Stage.show(Stage.java:259)
at anywheresoftware.b4j.objects.Form.Show(Form.java:204)
at coldbluelava.apps.iconstudio.main._appstart(main.java:152)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:593)
at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:228)
at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:158)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:93)
at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:90)
at anywheresoftware.b4a.BA.raiseEvent(BA.java:84)
at coldbluelava.apps.iconstudio.main.start(main.java:37)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$163(LauncherImpl.java:863)
at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$176(PlatformImpl.java:326)
at com.sun.javafx.application.PlatformImpl.lambda$null$174(PlatformImpl.java:295)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl.lambda$runLater$175(PlatformImpl.java:294)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$149(WinApplication.java:191)
at java.lang.Thread.run(Thread.java:745)
Nov 20, 2015 1:53:33 PM javafx.scene.control.Control loadSkinClass
SEVERE: Failed to load skin 'com.aquafx_project.controls.skin.AquaTabPaneSkin' for control TabPane@56a136aa[styleClass=tab-pane]
java.lang.NoSuchMethodError: com.sun.javafx.scene.traversal.TraversalEngine.<init>(Ljavafx/scene/Parent;Z)V
at com.aquafx_project.controls.skin.rt21682.TabPaneSkinHack$TabContentRegion$4.<init>(TabPaneSkinHack.java:1527)
at com.aquafx_project.controls.skin.rt21682.TabPaneSkinHack$TabContentRegion.<init>(TabPaneSkinHack.java:1527)
at com.aquafx_project.controls.skin.rt21682.TabPaneSkinHack.addTabContent(TabPaneSkinHack.java:370)
at com.aquafx_project.controls.skin.rt21682.TabPaneSkinHack.<init>(TabPaneSkinHack.java:191)
at com.aquafx_project.controls.skin.AquaTabPaneSkin.<init>(AquaTabPaneSkin.java:20)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:422)
at javafx.scene.control.Control.loadSkinClass(Control.java:722)
at javafx.scene.control.Control$4.invalidated(Control.java:659)
at javafx.beans.property.StringPropertyBase.markInvalid(StringPropertyBase.java:109)
at javafx.beans.property.StringPropertyBase.set(StringPropertyBase.java:144)
at javafx.css.StyleableStringProperty.set(StyleableStringProperty.java:83)
at javafx.scene.control.Control$4.set(Control.java:651)
at javafx.css.StyleableStringProperty.applyStyle(StyleableStringProperty.java:69)
at javafx.css.StyleableStringProperty.applyStyle(StyleableStringProperty.java:45)
at javafx.scene.CssStyleHelper.transitionToState(CssStyleHelper.java:774)
at javafx.scene.Node.impl_processCSS(Node.java:9189)
at javafx.scene.Parent.impl_processCSS(Parent.java:1241)
at javafx.scene.control.Control.impl_processCSS(Control.java:855)
at javafx.scene.Parent.impl_processCSS(Parent.java:1272)
at javafx.scene.Node.processCSS(Node.java:9056)
at javafx.scene.Scene.doCSSPass(Scene.java:545)
at javafx.scene.Scene.preferredSize(Scene.java:1643)
at javafx.scene.Scene.impl_preferredSize(Scene.java:1720)
at javafx.stage.Window$9.invalidated(Window.java:846)
at javafx.beans.property.BooleanPropertyBase.markInvalid(BooleanPropertyBase.java:109)
at javafx.beans.property.BooleanPropertyBase.set(BooleanPropertyBase.java:144)
at javafx.stage.Window.setShowing(Window.java:922)
at javafx.stage.Window.show(Window.java:937)
at javafx.stage.Stage.show(Stage.java:259)
at anywheresoftware.b4j.objects.Form.Show(Form.java:204)
at coldbluelava.apps.iconstudio.main._appstart(main.java:152)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:593)
at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:228)
at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:158)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:93)
at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:90)
at anywheresoftware.b4a.BA.raiseEvent(BA.java:84)
at coldbluelava.apps.iconstudio.main.start(main.java:37)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$163(LauncherImpl.java:863)
at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$176(PlatformImpl.java:326)
at com.sun.javafx.application.PlatformImpl.lambda$null$174(PlatformImpl.java:295)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl.lambda$runLater$175(PlatformImpl.java:294)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$149(WinApplication.java:191)
at java.lang.Thread.run(Thread.java:745)