Fatal error: Call to undefined method Mage_Adminhtml_Block_Widget::getrowurl()

Go To app/code/core/Mage/Adminhtml/Block/Widget/Grid.php

Search function getRowUrl in the file.
public function getRowUrl($item)
{
$res = parent::getRowUrl($item);
return ($res ? $res : '#');
}

Replace this function with below function:
public function getRowUrl($item)
{
$res = parent::getUrl($item);
return ($res ? $res : '#');
}