Warning: include(): Failed opening '/var/www/vhosts/camstage.com/httpdocs/vendor/composer/../../public_html/core/lib/Drupal/Core/DrupalKernelInterface.php' for inclusion (include_path='/var/www/vhosts/camstage.com/httpdocs/vendor/pear/archive_tar:/var/www/vhosts/camstage.com/httpdocs/vendor/pear/console_getopt:/var/www/vhosts/camstage.com/httpdocs/vendor/pear/pear-core-minimal/src:/var/www/vhosts/camstage.com/httpdocs/vendor/pear/pear_exception:.:/opt/plesk/php/5.6/share/pear') in /var/www/vhosts/camstage.com/httpdocs/vendor/composer/ClassLoader.php on line 576

Fatal error: Uncaught Error: Interface "Drupal\Core\DrupalKernelInterface" not found in /var/www/vhosts/camstage.com/httpdocs/public_html/core/lib/Drupal/Core/DrupalKernel.php:52 Stack trace: #0 /var/www/vhosts/camstage.com/httpdocs/vendor/composer/ClassLoader.php(576): include() #1 /var/www/vhosts/camstage.com/httpdocs/vendor/composer/ClassLoader.php(427): Composer\Autoload\{closure}() #2 /var/www/vhosts/camstage.com/httpdocs/public_html/index.php(16): Composer\Autoload\ClassLoader->loadClass() #3 {main} thrown in /var/www/vhosts/camstage.com/httpdocs/public_html/core/lib/Drupal/Core/DrupalKernel.php on line 52