java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at maxifilmfxml.MainController.lambda$null$0(MainController.java:59)
at com.jfoenix.controls.JFXDrawer.lambda$initListeners$104(JFXDrawer.java:197)
at com.jfoenix.controls.JFXDrawer.access$lambda$18(JFXDrawer.java)
at com.jfoenix.controls.JFXDrawer$$Lambda$19.changed(Unknown Source)
at com.sun.javafx.binding.ExpressionHelper$Generic.fireValueChangedEvent(ExpressionHelper.java:361)
at com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:81)
at javafx.beans.property.DoublePropertyBase.fireValueChangedEvent(DoublePropertyBase.java:106)
at javafx.beans.property.DoublePropertyBase.markInvalid(DoublePropertyBase.java:113)
at javafx.beans.property.DoublePropertyBase.set(DoublePropertyBase.java:147)
at javafx.css.StyleableDoubleProperty.set(StyleableDoubleProperty.java:82)
at com.sun.scenario.animation.shared.InterpolationInterval$DoubleInterpolationInterval.interpolate(InterpolationInterval.java:263)
at com.sun.scenario.animation.shared.SimpleClipInterpolator.interpolate(SimpleClipInterpolator.java:137)
at com.sun.scenario.animation.shared.TimelineClipCore.start(TimelineClipCore.java:151)
at javafx.animation.Timeline.impl_start(Timeline.java:195)
at javafx.animation.Animation.play(Animation.java:912)
at javafx.animation.Animation.playFrom(Animation.java:869)
at com.jfoenix.transitions.CachedTransition.interpolate(CachedTransition.java:99)
at javafx.animation.Transition.impl_playTo(Transition.java:210)
at javafx.animation.AnimationAccessorImpl.playTo(AnimationAccessorImpl.java:39)
at com.sun.scenario.animation.shared.SingleLoopClipEnvelope.timePulse(SingleLoopClipEnvelope.java:99)
at javafx.animation.Animation.impl_timePulse(Animation.java:1102)
at javafx.animation.Animation$1.lambda$timePulse$25(Animation.java:186)
at javafx.animation.Animation$1.timePulse(Animation.java:185)
at com.sun.scenario.animation.AbstractMasterTimer.timePulseImpl(AbstractMasterTimer.java:344)
at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:506)
at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:490)
at com.sun.javafx.tk.quantum.QuantumToolkit.lambda$runToolkit$404(QuantumToolkit.java:319)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191)
at java.lang.Thread.run(Thread.java:745)

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