java.lang.NullPointerException: Children: child node is null: parent = Group@1cb63fd[styleClass=root]

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    java.lang.NullPointerException: Children: child node is null: parent = Group@1cb63fd[styleClass=root]
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    java.lang.NullPointerException: Children: child node is null: parent = Group@1cb63fd[styleClass=root]
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    Root Cause Analysis

    1. java.lang.NullPointerException

      Children: child node is null: parent = Group@1cb63fd[styleClass=root]

      at javafx.scene.Parent$1.onProposedChange()
    2. javafx.scene
      Parent$1.onProposedChange
      1. javafx.scene.Parent$1.onProposedChange(Parent.java:316)
      1 frame
    3. com.sun.javafx
      ObservableListWrapper.add
      1. com.sun.javafx.collections.VetoableObservableList.add(VetoableObservableList.java:165)
      2. com.sun.javafx.collections.ObservableListWrapper.add(ObservableListWrapper.java:144)
      2 frames
    4. Cores
      FXVideoPlayer$3.run
      1. Cores.FXVideoPlayer$3.run(FXVideoPlayer.java:87)
      1 frame
    5. com.sun.javafx
      PlatformImpl$4$1.run
      1. com.sun.javafx.application.PlatformImpl$4$1.run(PlatformImpl.java:179)
      2. com.sun.javafx.application.PlatformImpl$4$1.run(PlatformImpl.java:176)
      2 frames
    6. Java RT
      AccessController.doPrivileged
      1. java.security.AccessController.doPrivileged(Native Method)
      1 frame
    7. com.sun.javafx
      PlatformImpl$4.run
      1. com.sun.javafx.application.PlatformImpl$4.run(PlatformImpl.java:176)
      1 frame
    8. com.sun.glass
      WinApplication$3$1.run
      1. com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
      2. com.sun.glass.ui.win.WinApplication.access$100(WinApplication.java:29)
      3. com.sun.glass.ui.win.WinApplication$3$1.run(WinApplication.java:73)
      3 frames
    9. Java RT
      Thread.run
      1. java.lang.Thread.run(Thread.java:722)
      1 frame