java.lang.IllegalStateException: Not on FX application thread; currentThread = main

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    java.lang.IllegalStateException: Not on FX application thread; currentThread = JavaFX Application Thread

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    Root Cause Analysis

    1. java.lang.IllegalStateException

      Not on FX application thread; currentThread = main

      at com.sun.javafx.tk.Toolkit.checkFxUserThread()
    2. com.sun.javafx
      QuantumToolkit.checkFxUserThread
      1. com.sun.javafx.tk.Toolkit.checkFxUserThread(Toolkit.java:204)
      2. com.sun.javafx.tk.quantum.QuantumToolkit.checkFxUserThread(QuantumToolkit.java:364)
      2 frames
    3. javafx.scene
      Node$11.invalidated
      1. javafx.scene.Scene.addToDirtyList(Scene.java:485)
      2. javafx.scene.Node.addToSceneDirtyList(Node.java:424)
      3. javafx.scene.Node.impl_markDirty(Node.java:415)
      4. javafx.scene.Node.impl_transformsChanged(Node.java:4502)
      5. javafx.scene.Node$11.invalidated(Node.java:2523)
      5 frames
    4. javafx.beans.property
      DoublePropertyBase.set
      1. javafx.beans.property.DoublePropertyBase.markInvalid(DoublePropertyBase.java:112)
      2. javafx.beans.property.DoublePropertyBase.set(DoublePropertyBase.java:146)
      2 frames
    5. javafx.scene
      Node.setLayoutY
      1. javafx.scene.Node.setLayoutY(Node.java:2510)
      1 frame
    6. FXSampler
      ScrollPaneSkin.lambda$initialize$432
      1. com.sun.javafx.scene.control.skin.ScrollPaneSkin.updatePosY(ScrollPaneSkin.java:1041)
      2. com.sun.javafx.scene.control.skin.ScrollPaneSkin.lambda$initialize$432(ScrollPaneSkin.java:322)
      2 frames