unable to run my JavaFX project on IntelliJ IDEA with JDK-11 - intellij-idea

Question

I am doing a project in IntelliJ IDEA on JavaFX application for the first time. I am unable to run my code.
When I first build->Run, I got an error saying that I require kotlin stdlib in my module,then I downloaded and added kotlin standard library into my module.
But now I am getting java.lang.NoClassDefFoundError in my code .
Sample.Main
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
public class Main extends Application {
#Override
public void start(Stage primaryStage) throws Exception{
Parent root = FXMLLoader.load(getClass().getResource("sample.fxml"));
primaryStage.setTitle("Hello World");
primaryStage.setScene(new Scene(root, 300, 275));
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}
module-info.java file
module Calculator {
requires javafx.fxml;
requires javafx.controls;
requires kotlin.stdlib;
opens Sample;
}
fxml file
<GridPane fx:controller="Sample.Controller"
xmlns:fx="http://javafx.com/fxml" alignment="center" hgap="10" vgap="10">
</GridPane>
error message:
"C:\Program Files\Java\jdk-11.0.1\bin\java.exe" "-javaagent:C:\Coding_Setups\JetBrains\IntelliJ IDEA Community Edition 2019.1.2\lib\idea_rt.jar=52562:C:\Coding_Setups\JetBrains\IntelliJ IDEA Community Edition 2019.1.2\bin" -Dfile.encoding=UTF-8 -classpath "G:\JavaFXproject\Calculator\out\production\Calculator;C:\Coding_Setups\javafx lib\javafx-sdk-11.0.2\lib\javafx.swing.jar;C:\Coding_Setups\javafx lib\javafx-sdk-11.0.2\lib\javafx.web.jar;C:\Coding_Setups\javafx lib\javafx-sdk-11.0.2\lib\javafx.media.jar;C:\Coding_Setups\javafx lib\javafx-sdk-11.0.2\lib\javafx.graphics.jar;C:\Coding_Setups\javafx lib\javafx-sdk-11.0.2\lib\javafx.fxml.jar;C:\Coding_Setups\javafx lib\javafx-sdk-11.0.2\lib\javafx.controls.jar;C:\Coding_Setups\javafx lib\javafx-sdk-11.0.2\lib\javafx.base.jar;C:\Coding_Setups\javafx lib\javafx-sdk-11.0.2\lib\javafx-swt.jar" sample.Main
Error: Could not find or load main class sample.Main
Caused by: java.lang.NoClassDefFoundError: Sample/Main (wrong name: sample/Main)
I am confused why would my javafx project demand for kotlin stdlib and why I have added it to my module I am getting a new error even when I have not changed the provided code yet.