Not able to perform action for new plugin in MAC

Hi, 

I have created a new plugin project on Mac OS  where i am able to see action on main menu, but when clicking on action nothing happened(i.e, its not entering into action performed method) where i am able to do it in windows.

<idea-plugin>
  <id>com.dbs.helloworl</id>
  <name>Hello World</name>
  <version>1.0</version>
  <vendor email="support1@yourcompany.com" url="http://www.yourcompany1.com">YourCompany1</vendor>

  <description><![CDATA[
     Hello World Description
    ]]></description>

  <change-notes><![CDATA[

    ]]>
  </change-notes>

  <!-- please see http://www.jetbrains.org/intellij/sdk/docs/basics/getting_started/build_number_ranges.html for description -->
  <idea-version since-build="173.0"/>

  <!-- please see http://www.jetbrains.org/intellij/sdk/docs/basics/getting_started/plugin_compatibility.html
       on how to target different products -->
  <!-- uncomment to enable plugin in all products
  <depends>com.intellij.modules.lang</depends>
  -->

  <extensions defaultExtensionNs="com.intellij">
    <!-- Add your extensions here -->
  </extensions>

  <actions>
    <!-- Add your actions here -->
    <group id="hello-world.MainMenu" text="Hello World" description="Hello World Desc">
      <add-to-group group-id="MainMenu" anchor="last"/>
      <action class="com.something.HelloWorld" id="hello-world.Actions.helloWorld"
              text="Hello World"/>
    </group>
  </actions>

</idea-plugin>

package com.something;

import com.intellij.openapi.actionSystem.AnAction;
import com.intellij.openapi.actionSystem.AnActionEvent;
import com.intellij.openapi.ui.Messages;

public class HelloWorld extends AnAction
{
    @Override
    public void actionPerformed(AnActionEvent e)
    {
//        BrowserUtil.browse("https://stackoverflow.com/questions/ask");
        System.out.println("Action called");
        Messages.showMessageDialog(e.getProject(),"Hello World", "Hey", Messages.getInformationIcon());
    }
}