scene builder not opening

i have downloaded the latest scene builder from gloun, and had my project settings done right. And yet i'm facing this error when i'm trying to open my fxml file

java.lang.ClassNotFoundException: com.sun.javafx.fxml.LoadListener PluginClassLoader[org.jetbrains.plugins.javaFX, 192.6817.30] com.intellij.ide.plugins.cl.PluginClassLoader@15d517ae

java.lang.NoClassDefFoundError: com/sun/javafx/fxml/LoadListener

com.intellij.diagnostic.PluginException: While loading class com.oracle.javafx.scenebuilder.kit.fxom.FXOMLoader: com/sun/javafx/fxml/LoadListener [Plugin: org.jetbrains.plugins.javaFX]