Migrating from Joomla 2.5 to 3x Creating Errors

Question

Trying to port some of the custom components that work well in Joomla 2.5.14 to Joomla 3.1.5, but get some errors, such as: 404 components not found in Joomla Backend and other errors in the interface

Is there any guide on migrating from Jooma 2.5 to 3x series, what changes need to be done in custom components

Front of the site 1st error

Notice: Use of undefined constant DS - assumed 'DS' in forms.php 

Second mistake

  Warning: require_once(com_formsDScontroller.php) [<a href='function.require-once'>function.require-once</a>]: failed to open stream: No such file or directory in forms.php 

Third mistake

  Fatal error: require_once() [<a href='function.require'>function.require</a>]: Failed opening required 'com_formsDScontroller.php' (include_path='.;C:\php\pear') in forms.php 

There were all errors showing forms.php, this

  <?php defined( '_JEXEC' ) or die( 'Restricted access' ); require_once( JPATH_COMPONENT.DS.'controller.php' ); if ($controller = JRequest::getWord('controller')) { $path = JPATH_COMPONENT.DS.'controllers'.DS.$controller.'.php'; if (file_exists($path)) { require_once $path; } else { $controller = ''; } } $classname = 'FormsController'.$controller; $controller = new $classname(); $controller->execute( JRequest::getVar( 'layout' ) ); $controller->redirect(); ?> 

Answer 1

Add line below

 defined( '_JEXEC' ) or die( 'Restricted access' ); if(!defined('DS')) define('DS', DIRECTORY_SEPARATOR); 

From docs

The DS constant has been removed. If you really need it, you can use DIRECTORY_SEPARATOR.

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