Cannot Create Role

Question

When i try to create a new role i get the following error message :

Fatal error: Class 'Mage_Slidermanger_Helper_Data' not found in /var/www/html/app/Mage.php on line 547

Find block of code that has 547 as its last line:

$registryKey = '_helper/' . $name;
if (!self::registry($registryKey)) {
    $helperClass = self::getConfig()->getHelperClassName($name);
    self::register($registryKey, new $helperClass);

Answer 1

I have encountered this issue before as well. You need to see if that class actually exists. It would either be located at

app/code/local/{vendorname}/Slidermanager/Helper/Data.php OR app/code/community/{vendorname}/Slidermanager/Helper/Data.php

If it does not exist in that location, that means the module's create was supposed to create but forgot to. You can create and install an empty one and your error will go away. Here is what you should create:

<?php

class {Vendorname}_Slidermanager_Helper_Data extends Mage_Core_Helper_Abstract
{

}

Answer 2

Possibility 1;

This issue might be happen if you have disable your slidermanger extension and its helper class in use just like $this->helper('slidermanger')

Possibility 2;

your helper config defination not match your module in your config.xml or adminhtml.xml

for example defination of helper

<helpers>
        <slidermanager>
            <class>YourVendor_Slidermanager_Helper</class>
        </slidermanager>
</helpers>

and use of helper

<slidermanager module="slidermanager">

Here module name should match with helper node of config.xml