I can't set this up with Gradle

[Souvlaki42]

I forked this legacy piece of software used in my university, to merge some PRs and add dark mode support through flatlaf: https://github.com/dpetersanderson/MARS and https://github.com/Souvlaki42/MARS

build.grade:

plugins {
    // Apply the application plugin to add support for building a CLI application in Java.
    id 'application'
}

version = '4.7'

application {
    // Define the main class for the application.
    mainClass = 'Mars'
}

java {
    withJavadocJar()
    withSourcesJar()

    sourceCompatibility = JavaVersion.VERSION_11
    targetCompatibility = JavaVersion.VERSION_11
}

javadoc {
}

jar {
    manifest {
        attributes['Implementation-Title'] = project.name
        attributes['Implementation-Version'] = project.version
        attributes['Main-Class'] = application.mainClass
    }
}

dependencies {
    implementation 'com.formdev:flatlaf:3.6.2'
    implementation 'com.github.Dansoftowner:jSystemThemeDetector:3.6'
}

settings.gradle:

rootProject.name = 'Mars'

dependencyResolutionManagement {
	repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
	repositories {
		mavenCentral()
		maven { url = 'https://jitpack.io' }
	}
}

Followed this: https://jitpack.io/#Dansoftowner/jSystemThemeDetector

But importing it like this:

import com.formdev.flatlaf.FlatDarkLaf;
import com.formdev.flatlaf.FlatLaf;
import com.formdev.flatlaf.FlatLightLaf;
import com.jthemedetector.OsThemeDetector;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;

public class Mars {

    public static void main(String[] args) {
        final OsThemeDetector detector = OsThemeDetector.getDetector();
        final boolean isDarkThemeUsed = detector.isDark();

        if (isDarkThemeUsed) {
            FlatDarkLaf.setup();
        } else {
            FlatLightLaf.setup();
        }

        detector.registerListener(isDark -> {
            SwingUtilities.invokeLater(() -> {
                try {
                    if (isDark) {
                        UIManager.setLookAndFeel(new FlatDarkLaf());
                    } else {
                        UIManager.setLookAndFeel(new FlatLightLaf());
                    }
                    FlatLaf.updateUI();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            });
        });

        new mars.MarsLaunch(args);
    }
}

Still doesn't resolve in the editor or after running this:

./gradlew clean build --refresh-dependencies

Am I doing something wrong or is the process broken? Thanks.