White Screen of front end after update

[fkoko]

Hey Guys,

Yesterday evening I made an update with "1-click-update" module from a well working PS 1.7.3.0 to 1.7.3.1 - Clients today reported white screen of the front page. Unfortunately I have not keep the error codes and immediately rolled back to 1.7.3.0 from manually back-up files and database.

The problem is that NOW, with PS 1.7.3.0 the Admin panel is White Screen. The php is 7.1 as it have been before the update.

Error reported in the log at the admin folder is:

 

[27-Apr-2018 14:55:21 Europe/Sofia] PHP Warning:  include(/home/sevoa/public_html/shop/vendor/composer/../doctrine/dbal/lib/Doctrine/DBAL/Query/Expression/ExpressionBuilder.php): failed to open stream: No such file or directory in /home/sevoa/public_html/shop/vendor/composer/ClassLoader.php on line 444
[27-Apr-2018 14:55:21 Europe/Sofia] PHP Warning:  include(): Failed opening '/home/sevoa/public_html/shop/vendor/composer/../doctrine/dbal/lib/Doctrine/DBAL/Query/Expression/ExpressionBuilder.php' for inclusion (include_path='/home/sevoa/public_html/shop/tools/htmlpurifier/standalone:/home/sevoa/public_html/shop/vendor/pear/pear_exception:/home/sevoa/public_html/shop/vendor/pear/console_getopt:/home/sevoa/public_html/shop/vendor/pear/pear-core-minimal/src:/home/sevoa/public_html/shop/vendor/pear/archive_tar:.:/usr/local/php7.1/lib/php') in /home/sevoa/public_html/shop/vendor/composer/ClassLoader.php on line 444
[27-Apr-2018 14:55:21 Europe/Sofia] PHP Fatal error:  Uncaught Symfony\Component\Debug\Exception\ClassNotFoundException: Attempted to load class "ExpressionBuilder" from namespace "Doctrine\DBAL\Query\Expression".
Did you forget a "use" statement for "Doctrine\Common\Collections\ExpressionBuilder"? in /home/sevoa/public_html/shop/vendor/doctrine/dbal/lib/Doctrine/DBAL/Connection.php:225
Stack trace:
#0 /home/sevoa/public_html/shop/vendor/doctrine/dbal/lib/Doctrine/DBAL/DriverManager.php(172): Doctrine\DBAL\Connection->__construct(Array, Object(Doctrine\DBAL\Driver\PDOMySql\Driver), Object(Doctrine\DBAL\Configuration), Object(Symfony\Bridge\Doctrine\ContainerAwareEventManager))
#1 /home/sevoa/public_html/shop/vendor/doctrine/doctrine-bundle/ConnectionFactory.php(58): Doctrine\DBAL\DriverManager::getConnection(Array, Object(Doctrine\DBAL\Configuration), Object(Symfony\Bridge\Doctrine\ContainerAwareEventManager))
#2 /home/sevoa/public_html/shop/app/cache/prod/appProdProjectContainer.php(675): Doctrine\Bundle\DoctrineBundle\ConnectionFactory->createConnection(Array, in /home/sevoa/public_html/shop/app/bootstrap.php.cache on line 3231

Please help....