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java.lang.NullPointerException: 	at com.sun.javafx.css.StyleManager.getURL(StyleManager.java:867)	at com.sun.javafx.css.StyleManager.loadStylesheetUnPrivileged(StyleManager.java:1057)	at com.sun.javafx.css.StyleManager.loadStylesheet(StyleManager.java:917)	at com.sun.javafx.css.StyleManager._setDefaultUserAgentStylesheet(StyleManager.java:1377)	at com.sun.javafx.css.StyleManager.setUserAgentStylesheets(StyleManager.java:1209)	at com.sun.javafx.application.PlatformImpl.lambda$_setPlatformUserAgentStylesheet$182(PlatformImpl.java:698)	at java.security.AccessController.doPrivileged(Native Method)	at com.sun.javafx.application.PlatformImpl._setPlatformUserAgentStylesheet(PlatformImpl.java:697)	at com.sun.javafx.application.PlatformImpl.setPlatformUserAgentStylesheet(PlatformImpl.java:548)	at com.sun.javafx.application.PlatformImpl.setDefaultPlatformUserAgentStylesheet(PlatformImpl.java:512)	at javafx.scene.control.Control.(Control.java:87)