Styles Errors

[kinsleykajiva]

I have been getting these console errors or logs in red about some style warning from this library.
for example, as shown below, what could be the cause of this:

Jul 21, 2022 10:17:26 PM javafx.scene.CssStyleHelper calculateValue
WARNING: Could not resolve '-on-surface-color' while resolving lookups for '-fx-fill' from rule '*#content-view *#add-module-view *.page-control *.tile-pane *.tile-box *.text-lbl *.text' in stylesheet jar:file:///home/variable-k/.m2/repository/com/dlsc/workbenchfx/workbenchfx-core/11.3.1/workbenchfx-core-11.3.1.jar!/com/dlsc/workbenchfx/css/main.css
Jul 21, 2022 10:17:26 PM javafx.scene.CssStyleHelper calculateValue
WARNING: Caught 'java.lang.ClassCastException: class java.lang.String cannot be cast to class javafx.scene.paint.Paint (java.lang.String is in module java.base of loader 'bootstrap'; javafx.scene.paint.Paint is in module [email protected] of loader 'platform')' while converting value for '-fx-background-color' from rule '*#content-view *#add-module-view>*.pagination-control>*.control-box>*.bullet-button:selected' in stylesheet jar:file:///home/variable-k/.m2/repository/com/dlsc/workbenchfx/workbenchfx-core/11.3.1/workbenchfx-core-11.3.1.jar!/com/dlsc/workbenchfx/css/main.css
Jul 21, 2022 10:17:27 PM javafx.scene.CssStyleHelper calculateValue
WARNING: Caught java.lang.IllegalArgumentException: Parsed value is not an Effect' while calculating value for '-fx-effect' from rule '*#content-view *#add-module-view *.page-control *.tile-pane *.tile-box:hover' in stylesheet jar:file:///home/variable-k/.m2/repository/com/dlsc/workbenchfx/workbenchfx-core/11.3.1/workbenchfx-core-11.3.1.jar!/com/dlsc/workbenchfx/css/main.css
Jul 21, 2022 10:17:27 PM javafx.scene.CssStyleHelper calculateValue
WARNING: Caught 'java.lang.ClassCastException: class java.lang.String cannot be cast to class javafx.scene.paint.Paint (java.lang.String is in module java.base of loader 'bootstrap'; javafx.scene.paint.Paint is in module [email protected] of loader 'platform')' while converting value for '-fx-background-color' from rule '*#content-view *#add-module-view *.page-control *.tile-pane *.tile-box' in stylesheet jar:file:///home/variable-k/.m2/repository/com/dlsc/workbenchfx/workbenchfx-core/11.3.1/workbenchfx-core-11.3.1.jar!/com/dlsc/workbenchfx/css/main.css
Jul 21, 2022 10:17:27 PM javafx.scene.CssStyleHelper calculateValue
WARNING: Could not resolve '-on-surface-color' while resolving lookups for '-fx-icon-color' from rule '*#content-view *#add-module-view *.page-control *.tile-pane *.tile-box *.ikonli-font-icon' in stylesheet jar:file:///home/variable-k/.m2/repository/com/dlsc/workbenchfx/workbenchfx-core/11.3.1/workbenchfx-core-11.3.1.jar!/com/dlsc/workbenchfx/css/main.css
Jul 21, 2022 10:17:27 PM javafx.scene.CssStyleHelper calculateValue
WARNING: Could not resolve '-on-surface-color' while resolving lookups for '-fx-fill' from rule '*#content-view *#add-module-view *.page-control *.tile-pane *.tile-box *.text-lbl *.text' in stylesheet jar:file:///home/variable-k/.m2/repository/com/dlsc/workbenchfx/workbenchfx-core/11.3.1/workbenchfx-core-11.3.1.jar!/com/dlsc/workbenchfx/css/main.css
Jul 21, 2022 10:17:28 PM javafx.scene.CssStyleHelper calculateValue
WARNING: Caught java.lang.IllegalArgumentException: Parsed value is not an Effect' while calculating value for '-fx-effect' from rule '*#content-view *#add-module-view *.page-control *.tile-pane *.tile-box:pressed' in stylesheet jar:file:///home/variable-k/.m2/repository/com/dlsc/workbenchfx/workbenchfx-core/11.3.1/workbenchfx-core-11.3.1.jar!/com/dlsc/workbenchfx/css/main.css
Jul 21, 2022 10:17:28 PM javafx.scene.CssStyleHelper calculateValue
WARNING: Caught 'java.lang.ClassCastException: class java.lang.String cannot be cast to class javafx.scene.paint.Paint (java.lang.String is in module java.base of loader 'bootstrap'; javafx.scene.paint.Paint is in module [email protected] of loader 'platform')' while converting value for '-fx-background-color' from rule '*#content-view *#add-module-view *.page-control *.tile-pane *.tile-box' in stylesheet jar:file:///home/variable-k/.m2/repository/com/dlsc/workbenchfx/workbenchfx-core/11.3.1/workbenchfx-core-11.3.1.jar!/com/dlsc/workbenchfx/css/main.css
Jul 21, 2022 10:17:28 PM javafx.scene.CssStyleHelper calculateValue
WARNING: Could not resolve '-on-surface-color' while resolving lookups for '-fx-icon-color' from rule '*#content-view *#add-module-view *.page-control *.tile-pane *.tile-box *.ikonli-font-icon' in stylesheet jar:file:///home/variable-k/.m2/repository/com/dlsc/workbenchfx/workbenchfx-core/11.3.1/workbenchfx-core-11.3.1.jar!/com/dlsc/workbenchfx/css/main.css