Codeigniter HMVC + ion_auth trouble loading the config items

This is the inner implementation of the CodeIgniter function config->item() found in the file system\core\Config.php

/** * Fetch a config file item * * @param   string  $item   Config item name * @param   string  $index  Index name * @return  string|null The configuration item or NULL if the item doesn't exist */public function item($item, $index = ''){    if ($index == '')    {        return isset($this->config[$item]) ? $this->config[$item] : NULL;    }    return isset($this->config[$index], $this->config[$index][$item]) ? $this->config[$index][$item] : NULL;}

When you pass the $index parameter, the function checks if both parameters are initialized in the config and returns config[$index] of the CI instance; or null if any of them is not initialized.

If config[$item] is not set in the CI instance, the function returns always null. Let's assume this is not the case, as your call don't crash when avoiding $index.

So when you pass $index as the second parameter, your code crashes because the function returns null, and that means that the config[$index] of the CI instance is not set. Now the question is why it's not set, and I can't help you here, but it looks like you are missing to load some modules.

Best regards