B4J Question Warnings when applying CSSUtils

I use in my program several CSSUtils commands in a module.
When the module is called for the first time, everything works without problems.
From the second call of the module I get warnings. Can one prevent or do I have to live with it?

Commands:
CSSUtils.SetStyleProperty(TA_Langtxt,"-fx-text-fill","RED")
SetColumnStyle(Liste_Angebot,0, "-fx-alignment: CENTER;")

Warnings:
Jul 29, 2017 4:51:55 PM javafx.scene.CssStyleHelper calculateValue
WARNING: Could not resolve '-fx-text-background-color' while resolving lookups for '-fx-text-fill' from rule '*.label' in stylesheet jar:file:/C:/Program%20Files/Java/jdk1.8.0_121/jre/lib/ext/jfxrt.jar!/com/sun/javafx/scene/control/skin/modena/modena.bss
Jul 29, 2017 4:51:55 PM javafx.scene.CssStyleHelper calculateValue
WARNING: Could not resolve '-fx-text-background-color' while resolving lookups for '-fx-text-fill' from rule '*.label' in stylesheet jar:file:/C:/Program%20Files/Java/jdk1.8.0_121/jre/lib/ext/jfxrt.jar!/com/sun/javafx/scene/control/skin/modena/modena.bss
Jul 29, 2017 4:51:55 PM javafx.scene.CssStyleHelper calculateValue
WARNING: Could not resolve '-fx-text-background-color' while resolving lookups for '-fx-text-fill' from rule '*.label' in stylesheet jar:file:/C:/Program%20Files/Java/jdk1.8.0_121/jre/lib/ext/jfxrt.jar!/com/sun/javafx/scene/control/skin/modena/modena.bss
Jul 29, 2017 4:51:55 PM javafx.scene.CssStyleHelper calculateValue
WARNING: Could not resolve '-fx-text-background-color' while resolving lookups for '-fx-text-fill' from rule '*.label' in stylesheet jar:file:/C:/Program%20Files/Java/jdk1.8.0_121/jre/lib/ext/jfxrt.jar!/com/sun/javafx/scene/control/skin/modena/modena.bss
Jul 29, 2017 4:51:56 PM javafx.scene.CssStyleHelper calculateValue
WARNING: Could not resolve '-fx-text-background-color' while resolving lookups for '-fx-text-fill' from rule '*.label' in stylesheet jar:file:/C:/Program%20Files/Java/jdk1.8.0_121/jre/lib/ext/jfxrt.jar!/com/sun/javafx/scene/control/skin/modena/modena.bss
Jul 29, 2017 4:51:56 PM javafx.scene.CssStyleHelper calculateValue
WARNING: Could not resolve '-fx-text-background-color' while resolving lookups for '-fx-text-fill' from rule '*.label' in stylesheet jar:file:/C:/Program%20Files/Java/jdk1.8.0_121/jre/lib/ext/jfxrt.jar!/com/sun/javafx/scene/control/skin/modena/modena.bss
Jul 29, 2017 4:51:56 PM javafx.scene.CssStyleHelper calculateValue
WARNING: Could not resolve '-fx-text-background-color' while resolving lookups for '-fx-text-fill' from rule '*.label' in stylesheet jar:file:/C:/Program%20Files/Java/jdk1.8.0_121/jre/lib/ext/jfxrt.jar!/com/sun/javafx/scene/control/skin/modena/modena.bss
Jul 29, 2017 4:51:56 PM javafx.scene.CssStyleHelper calculateValue
WARNING: Could not resolve '-fx-text-background-color' while resolving lookups for '-fx-text-fill' from rule '*.label' in stylesheet jar:file:/C:/Program%20Files/Java/jdk1.8.0_121/jre/lib/ext/jfxrt.jar!/com/sun/javafx/scene/control/skin/modena/modena.bss
Jul 29, 2017 4:51:56 PM javafx.scene.CssStyleHelper calculateValue
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