Call to undefined method MY_Loader::_ci_object_to_array()

If you get this error message;

An uncaught Exception was encountered
Type: Error
Message: Call to undefined method MY_Loader::_ci_object_to_array()
Filename: /home/karl/Documents/Development/Sites/cp/application/third_party/MX/Loader.php
Line Number: 300


On line 300 where it has this;

//return $this->_ci_load(array('_ci_view' => $view, '_ci_vars' => $this->_ci_object_to_array($vars), '_ci_return' => $return));

Comment out the line and add this instead.
if (method_exists($this, '_ci_object_to_array'))
{
return $this->_ci_load(array('_ci_view' => $view, '_ci_vars' => $this->_ci_object_to_array($vars), '_ci_return' => $return));
} else {
return $this->_ci_load(array('_ci_view' => $view, '_ci_vars' => $this->_ci_prepare_view_vars($vars), '_ci_return' => $return));
}