I pulled whole site from a git repo. Now I am getting this message when I try to access product in admin:  

    Fatal error: Class 'Mage_Uploader_Block_Multiple' not found in /Applications/XAMPP/xamppfiles/htdocs/libraccio/app/code/core/Mage/Adminhtml/Block/Media/Uploader.php on line 39

Everything else in admin seems to work fine. Displays fine, menus appear fine and other functionalities. What is causing this? 

Edited: I copied over whole directory `app/code/core/Mage/Uploader` from Magento 1.9.3 per Rafael's advice and now I get this message when I try to get to admin product page:  

    Fatal error: Uncaught Error: Call to a member function getConfig() on boolean in /Applications/XAMPP/xamppfiles/htdocs/libraccio/app/code/core/Mage/Adminhtml/Block/Catalog/Product/Helper/Form/Gallery/Content.php:50

Again, what can cause this?