CSV import is broken on my dev server with fork of MappingExtensions

[spikelynch]

 Error
Class "CSVImport\MappingExtensions\AbstractMapping" not found

Details:

Error: Class "CSVImport\MappingExtensions\AbstractMapping" not found in /var/www/html/public/modules/MappingExtensions/src/CsvMapping/CsvMapping.php:7
Stack trace:
#0 /var/www/html/public/vendor/laminas/laminas-loader/src/StandardAutoloader.php(309): include()
#1 /var/www/html/public/vendor/laminas/laminas-loader/src/StandardAutoloader.php(220): Laminas\Loader\StandardAutoloader->loadClass('MappingExtensio...', 'namespaces')
#2 /var/www/html/public/modules/CSVImport/src/Controller/IndexController.php(269): Laminas\Loader\StandardAutoloader->autoload('MappingExtensio...')
#3 /var/www/html/public/modules/CSVImport/src/Controller/IndexController.php(143): CSVImport\Controller\IndexController->getMappingsForResource('items')
#4 /var/www/html/public/vendor/laminas/laminas-mvc/src/Controller/AbstractActionController.php(71): CSVImport\Controller\IndexController->mapAction()
#5 /var/www/html/public/vendor/laminas/laminas-eventmanager/src/EventManager.php(319): Laminas\Mvc\Controller\AbstractActionController->onDispatch(Object(Laminas\Mvc\MvcEvent))
#6 /var/www/html/public/vendor/laminas/laminas-eventmanager/src/EventManager.php(179): Laminas\EventManager\EventManager->triggerListeners(Object(Laminas\Mvc\MvcEvent), Object(Closure))
#7 /var/www/html/public/vendor/laminas/laminas-mvc/src/Controller/AbstractController.php(97): Laminas\EventManager\EventManager->triggerEventUntil(Object(Closure), Object(Laminas\Mvc\MvcEvent))
#8 /var/www/html/public/vendor/laminas/laminas-mvc/src/DispatchListener.php(132): Laminas\Mvc\Controller\AbstractController->dispatch(Object(Laminas\Http\PhpEnvironment\Request), Object(Laminas\Http\PhpEnvironment\Response))
#9 /var/www/html/public/vendor/laminas/laminas-eventmanager/src/EventManager.php(319): Laminas\Mvc\DispatchListener->onDispatch(Object(Laminas\Mvc\MvcEvent))
#10 /var/www/html/public/vendor/laminas/laminas-eventmanager/src/EventManager.php(179): Laminas\EventManager\EventManager->triggerListeners(Object(Laminas\Mvc\MvcEvent), Object(Closure))
#11 /var/www/html/public/vendor/laminas/laminas-mvc/src/Application.php(325): Laminas\EventManager\EventManager->triggerEventUntil(Object(Closure), Object(Laminas\Mvc\MvcEvent))
#12 /var/www/html/public/index.php(21): Laminas\Mvc\Application->run()
#13 {main}

I suppose this is because I've been copying stuff to the docker image when developing and bypassing the formal install