Can't add jars to my project

Hello,

I can't add external libraries to my specific project that I created using the plugin - they dont appear in the external libraries.

I created My ModuleBuilder - that only extends JavaModuleBuilder and I override the ModuleType.

I created also my ModuleType - that only has the name, icon and stuff.

But once I created the specific project through my plugin I can't add any jars + when I go into the Project Structure and go to Modules - I only have the name of the project and nothing more - in contrast to the regular Java Project.

This is the code of the Builder:

package Module;

import com.intellij.ide.util.projectWizard.JavaModuleBuilder;
import com.intellij.ide.util.projectWizard.ModuleBuilderListener;
import com.intellij.ide.util.projectWizard.ModuleWizardStep;
import com.intellij.ide.util.projectWizard.WizardContext;
import com.intellij.openapi.Disposable;
import com.intellij.openapi.module.Module;
import com.intellij.openapi.module.ModuleType;
import com.intellij.openapi.options.ConfigurationException;
import com.intellij.openapi.roots.ModifiableRootModel;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

public class AgentZeroModuleBuilder extends JavaModuleBuilder {

    @Override
    public ModuleType getModuleType() {
        return AgentZeroModuleType.getInstance();
    }

}


this is the code of the Type:

package Module;

import com.intellij.ide.util.projectWizard.JavaModuleBuilder;
import com.intellij.ide.util.projectWizard.ModuleBuilder;
import com.intellij.ide.util.projectWizard.ModuleWizardStep;
import com.intellij.ide.util.projectWizard.WizardContext;
import com.intellij.openapi.module.ModuleType;
import com.intellij.openapi.module.ModuleTypeManager;
import com.intellij.openapi.roots.ui.configuration.ModulesProvider;
import com.intellij.openapi.util.IconLoader;
import org.jetbrains.annotations.NotNull;

import javax.swing.*;

import com.intellij.openapi.module.ModuleType;

import javax.swing.*;

/**
 * @author Konstantin Bulenkov
 */
public class AgentZeroModuleType extends ModuleType<AgentZeroModuleBuilder> {
    private static final String ID = "AGENTZERO_MODULE_TYPE";

    public AgentZeroModuleType() {
        super(ID);
    }

    public static AgentZeroModuleType getInstance() {
        return (AgentZeroModuleType) ModuleTypeManager.getInstance().findByID(ID);
    }

    @NotNull
    @Override
    public AgentZeroModuleBuilder createModuleBuilder() {
        return new AgentZeroModuleBuilder();
    }

    @NotNull
    @Override
    public String getName() {
        return "Demo Module Type";
    }

    @NotNull
    @Override
    public String getDescription() {
        return "Demo Module Type";
    }


    @Override
    public Icon getNodeIcon(@Deprecated boolean b) {
        return IconLoader.getIcon("/Icons/new-project.png");
    }

}


and there's a problem in the project structure that says:

Library Plugin Jars is not used 

but that doesnt happen if I create a regular java project without any java file that uses the jars.