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(1/1) UndefinedMethodException

Attempted to call an undefined method named "productSort" of class "BestSalesController".

in BestSalesController.php line 37
at BestSalesControllerCore->initContent()in Controller.php line 306
at ControllerCore->run()in Dispatcher.php line 518
at DispatcherCore->dispatch()in index.php line 28