How to fix an error in PHP if there is only such information?

Question

Zend Framework

How to fix an error in PHP if there is only such information?

Error Code: b51d22
exception 'Engine_Exception' with message 'Method "getViewer" not supported' in /var/www/html/ne/application/modules/Core/Api/Abstract.php:41
Stack trace:
#0 /var/www/html/ne/application/modules/Store/controllers/CartController.php(756): Core_Api_Abstract->__call('getViewer', Array)
#1 /var/www/html/ne/application/modules/Store/controllers/CartController.php(756): Core_Api_Core->getViewer()
#2 /var/www/html/ne/application/libraries/Zend/Controller/Action.php(516): Store_CartController->seeDetailsAction()
#3 /var/www/html/ne/application/libraries/Zend/Controller/Dispatcher/Standard.php(308): Zend_Controller_Action->dispatch('seeDetailsActio...')
#4 /var/www/html/ne/application/libraries/Zend/Controller/Front.php(954): Zend_Controller_Dispatcher_Standard->dispatch(Object(Zend_Controller_Request_Http), Object(Zend_Controller_Response_Http))
#5 /var/www/html/ne/application/modules/Core/Bootstrap.php(83): Zend_Controller_Front->dispatch()
#6 /var/www/html/ne/application/libraries/Engine/Application.php(160): Core_Bootstrap->run()
#7 /var/www/html/ne/application/index.php(211): Engine_Application->run()
#8 /var/www/html/ne/index.php(76): include('/var/www/html/n...')
#9 {main}

Answer 1

What does it mean how to fix it?
Find out why this method is not supported.
There is everything you need to search (the file name and line number where the error occurs, plus the call stacktrace)
Either you under-initialized something in the engine, or you are trying to access the wrong object.

Answer 2

The API version you are using does not support the method you are trying to call. Options: 1) you have a dock from one version of the API, and the code from another 2) you pull the object inside the CartController on line 756, which does not have such a method.