Project wizard in Pycharm

Martin, it's hard to guess what may be the reason – please provide a minimal project that would help reproduce the issue.

Thanks for a response Jakub Chrzanowski. There is nothing special, just copypasted code from docs, but can share, maybe I slipped somewhere.

<idea-plugin>
    <id>id...</id>
    <name>Name</name>
    <vendor>Vendor</vendor>

    <depends>com.intellij.modules.platform</depends>
    <depends>PythonCore</depends>

    <description>
        <![CDATA[
        Description..
    ]]>
    </description>

    <vendor url="https://www.vendor.com/">Vendor</vendor>
    <extensions defaultExtensionNs="com.intellij">
        <moduleBuilder builderClass="org.h2o.wizard.DemoModuleWizardStep" id="DEMO_STEP" order="first"/>
    </extensions>

</idea-plugin>

DemoModuleWizardStep.java

package org.h2o.wizard;

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.roots.ModifiableRootModel;
import com.intellij.openapi.roots.ui.configuration.ModulesProvider;
import org.jetbrains.annotations.NotNull;

import javax.swing.*;

public class DemoModuleWizardStep extends ModuleBuilder {

    @Override
    public void setupRootModel(@NotNull ModifiableRootModel model) { }

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

    @Override
    public ModuleWizardStep[] createWizardSteps(@NotNull WizardContext wizardContext, @NotNull ModulesProvider modulesProvider) {
        return new ModuleWizardStep[]{new ModuleWizardStep() {
            @Override
            public JComponent getComponent() {
                return new JLabel("Put your content here");
            }

            @Override
            public void updateDataModel() {

            }
        }};
    }
}