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java.lang.NullPointerException at com.sun.javafx.runtime.sequence.AbstractBoundComprehension$State.access$300(AbstractBoundComprehension.java:62) at com.sun.javafx.runtime.sequence.AbstractBoundComprehension$2.onChange(AbstractBoundComprehension.java:125) at com.sun.javafx.runtime.sequence.AbstractBoundSequence.notifyListeners(AbstractBoundSequence.java:140) at com.sun.javafx.runtime.sequence.AbstractBoundSequence.updateSlice(AbstractBoundSequence.java:80) at com.sun.javafx.runtime.sequence.BoundNumberRangeSequence$1.onChange(BoundNumberRangeSequence.java:133) at com.sun.javafx.runtime.location.DoubleVariable$4.action(DoubleVariable.java:182) at com.sun.javafx.runtime.location.DoubleVariable$4.action(DoubleVariable.java:179) at com.sun.javafx.runtime.util.AbstractLinkable.iterate(AbstractLinkable.java:78) at com.sun.javafx.runtime.location.DoubleVariable.notifyListeners(DoubleVariable.java:179) at com.sun.javafx.runtime.location.DoubleVariable.replaceValue(DoubleVariable.java:103) at com.sun.javafx.runtime.location.DoubleVariable.update(DoubleVariable.java:158) at com.sun.javafx.runtime.location.AbstractVariable.invalidate(AbstractVariable.java:179) at com.sun.javafx.runtime.location.AbstractLocation$4.action(AbstractLocation.java:141) at com.sun.javafx.runtime.location.AbstractLocation$4.action(AbstractLocation.java:135) at com.sun.javafx.runtime.util.AbstractLinkable.iterate(AbstractLinkable.java:83) at com.sun.javafx.runtime.location.AbstractLocation.invalidateDependencies(AbstractLocation.java:162) at com.sun.javafx.runtime.location.AbstractLocation.invalidate(AbstractLocation.java:115) at com.sun.javafx.runtime.location.AbstractVariable.invalidate(AbstractVariable.java:177) at com.sun.javafx.runtime.location.AbstractLocation$4.action(AbstractLocation.java:141) at com.sun.javafx.runtime.location.AbstractLocation$4.action(AbstractLocation.java:135) at com.sun.javafx.runtime.util.AbstractLinkable.iterate(AbstractLinkable.java:83)