Error with undefined method CI_Loader::plugin() - codeigniter

Question

I received the following error:
Call to undefined method CI_Loader::plugin() in C:\wamp\www\Code\application\libraries\DX_Auth.php on line 1233
on this code:
function captcha()
{
$this->ci->load->helper('url');
$this->ci->load->plugin('dx_captcha');
$captcha_dir = trim($this->ci->config->item('DX_captcha_path'), './');

Answer 1

Make sure you have moved any array values in application/config/autoload.php from $autoload[‘plugins’] to $autoload[‘helpers’] or you will notice stuff break.
This is the reference

Answer 2

Which version of CI are you using? Plugins has been removed since the 2.x and replaced with helper.
Try to use reCaptcha instead, it has a good library.

Answer 3

You're trying to load a plugin and plugins are not supported, if I remember it right since CI version 2. If that's the case (which seems to be) you need to convert your plugins into helpers.

Answer 4

I think you are trying to use an old version of DX_Auth on new version of CodeIgniter. Current version of DX_Auth is compatible with CI 2.x and is available on github.

Answer 5

A simple way to solve this problem is that you just put this code in your loader.php. The plugin its works. Go to System->Core->Loader.php.
/**
* Load Plugin
*
* This function loads the specified plugin.
*
* #access public
* #param array
* #return void
*/
function plugin($plugins = array())
{
if ( ! is_array($plugins))
{
$plugins = array($plugins);
}
foreach ($plugins as $plugin)
{
$plugin = strtolower(str_replace(EXT, '', str_replace('_pi', '', $plugin)).'_pi');
if (isset($this->_ci_plugins[$plugin]))
{
continue;
}
if (file_exists(APPPATH.'plugins/'.$plugin.EXT))
{
include_once(APPPATH.'plugins/'.$plugin.EXT);
}
else
{
if (file_exists(BASEPATH.'plugins/'.$plugin.EXT))
{
include_once(BASEPATH.'plugins/'.$plugin.EXT);
}
else
{
show_error('Unable to load the requested file: plugins/'.$plugin.EXT);
}
}
$this->_ci_plugins[$plugin] = TRUE;
log_message('debug', 'Plugin loaded: '.$plugin);
}
}
// --------------------------------------------------------------------
/**
* Load Plugins
*
* This is simply an alias to the above function in case the
* user has written the plural form of this function.
*
* #access public
* #param array
* #return void
*/
function plugins($plugins = array())
{
$this->plugin($plugins);
}