Project is atached.

java.lang.IllegalArgumentException: Radius must be greater than zero
        at java.awt.RadialGradientPaint.<init>(RadialGradientPaint.java:433)
        at com.sun.prism.j2d.J2DPrismGraphics.toJ2DPaint(J2DPrismGraphics.java:162)
        at com.sun.prism.j2d.J2DPrismGraphics.fill(J2DPrismGraphics.java:519)
        at com.sun.prism.j2d.J2DPrismGraphics.fill(J2DPrismGraphics.java:525)
        at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:139)
        at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:103)
        at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:39)
        at com.sun.javafx.sg.BaseNode.render(BaseNode.java:1000)
        at com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:161)
        at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:352)
        at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:103)
        at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:39)
        at com.sun.javafx.sg.BaseNode.render(BaseNode.java:1000)
        at com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:161)
        at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:352)
        at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:103)
        at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:39)
        at com.sun.javafx.sg.BaseNode.render(BaseNode.java:1000)
        at com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:161)
        at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:352)
        at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:103)
        at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:39)
        at com.sun.javafx.sg.BaseNode.render(BaseNode.java:1000)
        at com.sun.javafx.tk.quantum.PaintRunnable.paintImpl(PaintRunnable.java:137)
        at com.sun.javafx.tk.quantum.PaintRunnable.run(PaintRunnable.java:236)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
        at java.util.concurrent.FutureTask$Sync.innerRunAndReset(FutureTask.java:317)
        at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:150)
        at com.sun.prism.tkal.RenderJob.run(RenderJob.java:29)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at com.sun.javafx.tk.quantum.QuantumRenderer$ObservedRunnable.run(QuantumRenderer.java:73)
        at java.lang.Thread.run(Thread.java:662)