Route serialization incompatibilities between PHP 7.4 and 7.3 (9.x only)

The website encountered an unexpected error. Please try again later. TypeError: Argument 2 passed to Symfony\Component\Routing\RouteCollection::add() must be an instance of Symfony\Component\Routing\Route, bool given, called in /home/nigel/public_html/sites/pdftron-test/web/core/lib/Drupal/Core/Routing/RouteProvider.php on line 382 in Symfony\Component\Routing\RouteCollection->add() (line 74 of /home/nigel/public_html/sites/pdftron-test/vendor/symfony/routing/RouteCollection.php). Symfony\Component\Routing\RouteCollection->add('user.reset.login', ) (Line: 382) Drupal\Core\Routing\RouteProvider->getRoutesByPath('/user/reset/1/1591246278/kePofF69JBJQtdHnGINRNWbr46V9akA4vIAtpmHFb0E/login') (Line: 182) Drupal\Core\Routing\RouteProvider->getRouteCollectionForRequest(Object) (Line: 237) Drupal\Core\Routing\Router->getInitialRouteCollection(Object) (Line: 121) Drupal\Core\Routing\Router->matchRequest(Object) (Line: 92) Drupal\Core\Routing\AccessAwareRouter->matchRequest(Object) (Line: 112) Symfony\Component\HttpKernel\EventListener\RouterListener->onKernelRequest(Object, 'kernel.request', Object) (Line: 78) Symfony\Component\EventDispatcher\LegacyEventDispatcherProxy->dispatch(Object, 'kernel.request') (Line: 134) Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 80) Symfony\Component\HttpKernel\HttpKernel->handle(Object, 1, 1) (Line: 57) Drupal\Core\StackMiddleware\Session->handle(Object, 1, 1) (Line: 47) Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 1, 1) (Line: 106) Drupal\page_cache\StackMiddleware\PageCache->pass(Object, 1, 1) (Line: 85) Drupal\page_cache\StackMiddleware\PageCache->handle(Object, 1, 1) (Line: 47) Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 52) Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 23) Stack\StackedHttpKernel->handle(Object, 1, 1) (Line: 705) Drupal\Core\DrupalKernel->handle(Object) (Line: 19)

Array ( [Laminas\Xml\] => ZendXml\ [Laminas\OAuth\] => ZendOAuth\ [Laminas\Diagnostics\] => ZendDiagnostics\ [Laminas\DeveloperTools\] => ZendDeveloperTools\ [Laminas\ReCaptcha\] => ZendService\ReCaptcha\ [Laminas\Twitter\] => ZendService\Twitter\ [Laminas\] => Zend\ [Mezzio\ProblemDetails\] => Zend\ProblemDetails\ [Mezzio\] => Zend\Expressive\ [Laminas\ComposerAutoloading\] => ZF\ComposerAutoloading\ [Laminas\DevelopmentMode\] => ZF\DevelopmentMode\ [Laminas\ApiTools\Admin\] => ZF\Apigility\Admin\ [Laminas\ApiTools\Doctrine\] => ZF\Apigility\Doctrine\ [Laminas\ApiTools\Documentation\] => ZF\Apigility\Documentation\ [Laminas\ApiTools\Example\] => ZF\Apigility\Example\ [Laminas\ApiTools\Provider\] => ZF\Apigility\Provider\ [Laminas\ApiTools\Welcome\] => ZF\Apiglity\Welcome\ [Laminas\ApiTools\] => ZF\ )

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🇨🇴Colombia aldibier Manizales

Hi people, I had this issue and none previous patch solve my problem, after trying many options, I solved this issue following this Steps.

1. truncate table router in database:

TRUNCATE TABLE router;

2. truncate all cache tables, prevously i've identified all cache tables listing tables in database.

TRUNCATE TABLE  cache_advagg                           ;
TRUNCATE TABLE  cache_bootstrap                        ;
TRUNCATE TABLE  cache_config                           ;
TRUNCATE TABLE  cache_container                        ;
TRUNCATE TABLE  cache_data                             ;
TRUNCATE TABLE  cache_default                          ;
TRUNCATE TABLE  cache_discovery                        ;
TRUNCATE TABLE  cache_dynamic_page_cache               ;
TRUNCATE TABLE  cache_entity                           ;
TRUNCATE TABLE  cache_jsonapi_normalizations           ;
TRUNCATE TABLE  cache_menu                             ;
TRUNCATE TABLE  cache_page                             ;
TRUNCATE TABLE  cache_render                           ;
TRUNCATE TABLE  cache_rest                             ;
TRUNCATE TABLE  cache_schema_metatag_cache             ;
TRUNCATE TABLE  cache_toolbar                          ;
TRUNCATE TABLE  cachetags ;

3. Execute router rebuild using druhs.

drush ev "\Drupal::service('router.builder')->rebuild()"

4. Clear Cache

drush cr