下記のようなエラーが出て商品購入ができません。
どのように対処したらいいのでしょうか？
お教えください。

phpのバージョン変更はやってみました。

Whoops, looks like something went wrong.
1/1
ContextErrorException in UnitOfWork.php line 2640:
Warning: "continue" targeting switch is equivalent to "break". Did you mean to use "continue 2"?
in UnitOfWork.php line 2640
at ErrorHandler->handleError('2', '"continue" targeting switch is equivalent to "break". Did you mean to use "continue 2"?', '/home/c0747813/public_html/dagouma.com/sample/vendor/doctrine/orm/lib/Doctrine/ORM/UnitOfWork.php', '2640', array('class' => 'Doctrine\ORM\UnitOfWork', 'file' => '/home/c0747813/public_html/dagouma.com/sample/vendor/composer/../doctrine/orm/lib/Doctrine/ORM/UnitOfWork.php')) in DebugClassLoader.php line 169
at require() in DebugClassLoader.php line 169
at DebugClassLoader->loadClass('Doctrine\ORM\UnitOfWork')
at spl_autoload_call('Doctrine\ORM\UnitOfWork') in EntityManager.php line 158
at EntityManager->__construct(object(Connection), object(Configuration), object(EventManager)) in EntityManager.php line 817
at EntityManager::create(object(Connection), object(Configuration), object(EventManager)) in DoctrineOrmServiceProvider.php line 109
at DoctrineOrmServiceProvider->Dflydev\Pimple\Provider\DoctrineOrm\{closure}(object(Pimple)) in Pimple.php line 126
at Pimple::{closure}(object(Pimple)) in Pimple.php line 83
at Pimple->offsetGet('default') in DoctrineOrmServiceProvider.php line 415
at DoctrineOrmServiceProvider->Dflydev\Pimple\Provider\DoctrineOrm\{closure}(object(Application)) in Pimple.php line 126
at Pimple::{closure}(object(Application)) in Pimple.php line 83
at Pimple->offsetGet('orm.em') in Application.php line 497
at Application->initDoctrine() in Application.php line 179
at Application->initialize() in index_dev.php line 68