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Not on FX application thread; currentThread = main
java.lang.IllegalStateException: Not on FX application thread; currentThread = Thread-26	at com.sun.javafx.tk.Toolkit.checkFxUserThread(Toolkit.java:236)	at com.sun.javafx.tk.quantum.QuantumToolkit.checkFxUserThread(QuantumToolkit.java:423)	at javafx.scene.web.WebEngine.checkThread(WebEngine.java:1216)	at javafx.scene.web.WebEngine.executeScript(WebEngine.java:980)