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javafx错误Exception in Application start method

at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:900) at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda ...
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大佬们，我javafx为什么会报错啊

我用jdk14和IDEA，想用javafx开发gui，但是只要我尝试增加组件或导入fxml,就会报Exception in Application start method错误 at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at ...