Error 404 while trying to create new Adminhtml page

Question

I'm using Magento 1.9.0.1 and i've created a new extension in which i've added a new tab in the admin panel take a look at the picture.

enter image description here

Here is what i have in my files.

In: /app/code/community/VivasIndustries/SmsNotification/etc/config.xml:

<?xml version="1.0"?>
<config>
 <modules>
 <VivasIndustries_SmsNotification>
 <version>0.1.0</version>
 </VivasIndustries_SmsNotification>
 </modules>
 <global>
 <models>
 <smsnotification>
 <class>VivasIndustries_SmsNotification_Model</class>
 </smsnotification>
 </models> 
 <events>
 <sales_order_save_after>
 <observers>
 <vivasindustries_smsnotification>
 <class>smsnotification/observer</class>
 <method>orderSaved</method>
 </vivasindustries_smsnotification>
 </observers>
 </sales_order_save_after>
 </events>
 <helpers>
 <smsnotification>
 <class>VivasIndustries_SmsNotification_Helper</class>
 </smsnotification>
 </helpers> 
 <adminhtml>
 <rewrite>
 <data>VivasIndustries_SmsNotification_Helper_Adminhtml_Data</data>
 </rewrite>
 </adminhtml>
 </global>
 <adminhtml>
 <acl>
 <resources>
 <all>
 <title>Allow Everything</title>
 </all>
 <admin>
 <children>
 <system>
 <children>
 <config>
 <children>
 <vivas>
 <title>Vivas - All</title>
 </vivas>
 </children>
 </config>
 </children>
 </system>
 </children>
 </admin>
 </resources>
 </acl>
 </adminhtml>
 <admin>
 <routers>
 <adminhtml>
 <args>
 <modules>
 <VivasIndustries_SmsNotification before="Mage_Adminhtml">VivasIndustries_SmsNotification_Adminhtml</VivasIndustries_SmsNotification>
 </modules>
 </args>
 </adminhtml>
 </routers>
 </admin>
</config> 

Here is what i have in: /app/code/community/VivasIndustries/SmsNotification/etc/adminhtml.xml:

<?xml version="1.0"?>
<config>
 <menu>
 <vivassms translate="title" module="smsnotification">
 <title>SMS Center</title>
 <sort_order>110</sort_order>
 <children>
 <sendsms translate="title" module="smsnotification">
 <title>Send SMS</title>
 <action>adminhtml/magesms_sendsms</action>
 <sort_order>1</sort_order>
 </sendsms>
 <settings>
 <title>Settings</title>
 <action>adminhtml/system_config/edit/section/vivas/</action>
 <sort_order>10</sort_order>
 </settings>
 <about translate="title" module="smsnotification">
 <title>About</title>
 <action>adminhtml/smsnotification_about</action>
 <sort_order>11</sort_order>
 </about>
 </children>
 </vivassms>
 </menu>
 <acl>
 <resources>
 <admin>
 <children>
 <vivassms>
 <title>SMS</title>
 <children>
 <sendsms translate="title" module="smsnotification">
 <title>Send SMS</title>
 </sendsms>
 <settings>
 <title>Settings</title>
 <children>
 <smsprofile translate="title" module="smsnotification">
 <title>Edit user account</title>
 </smsprofile>
 </children>
 </settings>
 <about translate="title" module="smsnotification">
 <title>About</title>
 </about>
 </children>
 </vivassms>
 <system>
 <children>
 <config>
 <children>
 <vivassms translate="title" module="smsnotification">
 <title>Vivas SMS</title>
 </vivassms>
 </children>
 </config>
 </children>
 </system>
 </children>
 </admin>
 </resources>
 </acl>
</config>

Here is what i have in: /app/code/community/VivasIndustries/SmsNotification/controllers/Adminhtml/SmsNotification/AboutController.php:

<?php
class VivasIndustries_SmsNotification_Adminhtml_AboutController extends Mage_Adminhtml_Controller_Action
{ 
 public function preDispatch() 
 { 
 return Mage_Adminhtml_Controller_Action::preDispatch(); 
 } 
 public function indexAction() 
 {
 $this->_initAction();
 $i8ee45e0018a32fb1a855b82624506e35789cc4d2 = $this->getLayout()->createBlock( 'Mage_Core_Block_Template', 'my_block_name_here', array('template' => 'vivasindustries/smsnotification/about.phtml') );
 $this->getLayout()->getBlock('content')->append($i8ee45e0018a32fb1a855b82624506e35789cc4d2); $this->renderLayout(); 
 } 
 protected function _initAction() 
 { 
 parent::_initAction(); 
 $this->_setActiveMenu('smsnotification/about') ->_title(Mage::helper('smsnotification')->__('About')); 
 return $this; 
 } 
}

Here is what i have in: /app/design/adminhtml/default/default/template/vivasindustries/smsnotification/about.phtml:

<?php
/**
 * Mage SMS - SMS notification & SMS marketing
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the BSD 3-Clause License
 * It is available through the world-wide-web at this URL:
 * http://opensource.org/licenses/BSD-3-Clause
 *
 * @category Vivas
 * @package Vivas_smsnotification
 * @copyright Copyright (c) 2012-2014 Vivas s.r.o. (http://www.mage-sms.com)
 * @license http://opensource.org/licenses/BSD-3-Clause
 */
?>
<h2>
<?php 
echo Mage::helper('smsnotification')->__('About'); ?></h2>
<b><?php echo Mage::helper('smsnotification')->__('Mage SMS module 2013-%s, version ', date('Y')).Mage::getConfig()->getModuleConfig('VivasIndustries_SmsNotification')->version; ?></b><br />
<?php echo Mage::helper('smsnotification')->__('Copyright © Vivas s.r.o., All rights reserved'); ?><br /><br />
<b><?php echo Mage::helper('smsnotification')->__('Supported Magento versions:'); ?></b><?php echo Mage::getConfig()->getNode('default/config/supported')->versions; ?><br /><br />
<b><?php echo Mage::helper('smsnotification')->__('Developer:'); ?></b><br /><?php echo Mage::helper('smsnotification')->__('Vivas s.r.o.'); ?><br /><br />
<b><?php echo Mage::helper('smsnotification')->__('Address:'); ?></b><br /><?php echo Mage::helper('smsnotification')->__('B. Nemcove 767/13'); ?><br /><?php echo Mage::helper('smsnotification')->__('78701 Sumperk'); ?><br />
<?php echo Mage::helper('smsnotification')->__('Czech Republic'); ?><br /><?php echo Mage::helper('smsnotification')->__('VAT: CZ29444268'); ?><br /><br /><b><?php echo Mage::helper('smsnotification')->__('Office Telephone:'); ?></b><br />
<?php echo Mage::helper('smsnotification')->__('[phone]'); ?><br /><br /><b><?php echo Mage::helper('smsnotification')->__('E-mail:'); ?></b><br />
<a href="mailto:<?php echo Mage::helper('smsnotification')->__('[email protected]'); ?>"><?php echo Mage::helper('smsnotification')->__('[email protected]'); ?></a><br />
<a href="mailto:<?php echo Mage::helper('smsnotification')->__('[email protected]'); ?>"><?php echo Mage::helper('smsnotification')->__('[email protected]'); ?></a><br /><br />
<b><?php echo Mage::helper('smsnotification')->__('Web:'); ?></b><br />
<a href="http://<?php echo Mage::helper('smsnotification')->__('www.mage-sms.com'); ?>"><?php echo Mage::helper('smsnotification')->__('www.mage-sms.com'); ?></a><br /><br />
<b><?php echo Mage::helper('smsnotification')->__('Facebook:'); ?></b><br /><iframe src="//www.facebook.com/plugins/like.php?href=https%3A%2F%2Fwww.facebook.com%2Fmagentosms&amp;width&amp;layout=button_count&amp;action=like&amp;show_faces=false&amp;share=true&amp;height=21&amp;appId=242281502635180" scrolling="no" frameborder="0" style="border:none; overflow:hidden; height:21px;" allowTransparency="true"></iframe><br /><br />
<b><?php echo Mage::helper('smsnotification')->__('Manual:'); ?></b><br /><a href="http://<?php echo Mage::helper('smsnotification')->__('www.mage-sms.com/manual.html'); ?>"><?php echo Mage::helper('smsnotification')->__('www.mage-sms.com/manual.html'); ?></a><br /><br />
<img src="<?php echo Mage::getBaseUrl(Mage_Core_Model_Store::URL_TYPE_MEDIA).'smsnotification/Vivas-logo.gif'; ?>" alt="Vivas" />

When i try to open the About page i got error 404. Can you please help me fix this error and give me info why i got this problem?

EDIT: Image of the Error:

enter image description here

Thanks in advance!

• seanbreeden: The main reason I've seen for people getting 404 in the admin is due to not logging out and logging back in (to reload the ACL) after an extension install.
• Venelin Vasilev: That is not the reason here. I got 404 at the frontend when i try to open the About page. The 404 error is not received in the Admin Panel but in the frontend which i think is awkward..

Answer 1

In your config.xml you didn't close a node.

 </smsnotification>
 <adminhtml>
 <rewrite>

Should be:

 </smsnotification>
 </helpers>
 <adminhtml>
 <rewrite>

And you have the closing helpers tag in the wrong section:

 </adminhtml>
 </helpers>
 </global>

Should be:

 </adminhtml>
 </global>

---

EDIT:

I'm not sure why this is in there. Try removing it:

 <adminhtml>
 <rewrite>
 <data>VivasIndustries_SmsNotification_Helper_Adminhtml_Data</data>
 </rewrite>
 </adminhtml>

Also change this in your adminhtml.xml:

 <about translate="title" module="smsnotification">
 <title>About</title>
 <action>adminhtml/about</action>
 <sort_order>11</sort_order>
 </about>

Move: /app/code/community/VivasIndustries/SmsNotification/controllers/Adminhtml/SmsNotification/AboutController.php to /app/code/community/VivasIndustries/SmsNotification/controllers/Adminhtml/AboutController.php

• Venelin Vasilev: I did what you suggest to me and the error is still here. Any additional advice ?
• seanbreeden: Edit your Question with your latest app/code/community/VivasIndustries/SmsNotification/etc/config.xml
• Venelin Vasilev: Done. I've edited my question with the latest config.xml. Please check it out!
• seanbreeden: Answer edited. Try again
• seanbreeden: Try changing your adminhtml.xml <action> to adminhtml/about and drop the smsnotification