Necesito un verdadero experto en Drupal 8.
Actualmente tengo un servidor con una implementación en producción, pero manda este error al querer actualizar:
Error: Undefined class constant 'PARSE_EXCEPTION_ON_INVALID_TYPE' in /var/www/rgasesores/core/lib/Drupal/Component/Serialization/
YamlSymfony.php on line 37 #0 /var/www/rgasesores/core/lib/Drupal/Component/Serialization/
Yaml.php(35): Drupal\Component\Serialization\YamlSymfony::decode('parameters:\n s...')
#1 /var/www/rgasesores/core/lib/Drupal/Core/DependencyInjection/
YamlFileLoader.php(332): Drupal\Component\Serialization\Yaml::decode('parameters:\n s...')
#2 /var/www/rgasesores/core/lib/Drupal/Core/DependencyInjection/
YamlFileLoader.php(63): Drupal\Core\DependencyInjection\YamlFileLoader->loadFile('core/
core.servi...')
#3 /var/www/rgasesores/core/lib/Drupal/Core/
DrupalKernel.php(1288): Drupal\Core\DependencyInjection\YamlFileLoader->load('core/
core.servi...')
#4 /var/www/rgasesores/core/lib/Drupal/Core/
DrupalKernel.php(893): Drupal\Core\DrupalKernel->compileContainer()
#5 phar:///usr/local/bin/drush/lib/Drush/Drupal/
DrupalKernel.php(61): Drupal\Core\DrupalKernel->initializeContainer()
#6 /var/www/rgasesores/core/lib/Drupal/Core/
DrupalKernel.php(469): Drush\Drupal\DrupalKernel->initializeContainer()
#7 phar:///usr/local/bin/drush/lib/Drush/Boot/
DrupalBoot8.php(146): Drupal\Core\DrupalKernel->boot()
#8 phar:///usr/local/bin/drush/includes/
bootstrap.inc(354): Drush\Boot\DrupalBoot8->bootstrap_drupal_full()
#9 phar:///usr/local/bin/drush/includes/
bootstrap.inc(473): drush_bootstrap(5, 6)
#10 phar:///usr/local/bin/drush/lib/Drush/Boot/
BaseBoot.php(59): drush_bootstrap_to_phase(6)
#11 phar:///usr/local/bin/drush/includes/
preflight.inc(66): Drush\Boot\BaseBoot->bootstrap_and_dispatch()
#12 phar:///usr/local/bin/drush/includes/
startup.inc(465): drush_main()
#13 phar:///usr/local/bin/drush/includes/
startup.inc(369): drush_run_main(false, '/', 'Phar detected. ...')
#14 phar:///usr/local/bin/drush/drush(114): drush_startup(Array)
#15 /usr/local/bin/drush(10): require('phar:///usr/loc...')
#16 {main}
Drush command terminated abnormally due to an unrecoverable error. [Error]
Error: Undefined class constant 'PARSE_EXCEPTION_ON_INVALID_TYPE' in Drupal\Component\Serialization\YamlSymfony::decode() (line 37 of /var/www/rgasesores/core/lib/Drupal/Component/Serialization/
YamlSymfony.php).
Root@www:/var/www/rgasesores#
Necesito que este error sea corregido de raíz para que no vuelva a suceder.
Y por supuesto que la paquetería sea actualizada completamente.
Plazo de Entrega: 10 Enero, 2019