Service ‘page_manager.variant_route_filter’ for consumer ‘router.no_access_checks’ does not implement

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Symfony\Component\DependencyInjection\Exception\LogicException: Service ‘page_manager.variant_route_filter’ for consumer ‘router.no_access_checks’ does not implement Drupal\Core\Routing\FilterInterface. in Drupal\Core\DependencyInjection\Compiler\TaggedHandlersPass->processServiceCollectorPass() (line 164 of D:\xampp\htdocs\axway\corporate-8\web\core\lib\Drupal\Core\DependencyInjection\Compiler\TaggedHandlersPass.php).
Drupal\Core\DependencyInjection\Compiler\TaggedHandlersPass->processServiceCollectorPass(Array, ‘router.no_access_checks’, Object) (Line: 97)
Drupal\Core\DependencyInjection\Compiler\TaggedHandlersPass->process(Object) (Line: 141)
Symfony\Component\DependencyInjection\Compiler\Compiler->compile(Object) (Line: 757)
Symfony\Component\DependencyInjection\ContainerBuilder->compile() (Line: 1307)
Drupal\Core\DrupalKernel->compileContainer() (Line: 884)
Drupal\Core\DrupalKernel->initializeContainer() (Line: 466)
Drupal\Core\DrupalKernel->boot() (Line: 656)
Drupal\Core\DrupalKernel->handle(Object) (Line: 19)

We can solve the problem by applying the following patch:

cd modules/contrib/page_manager
wget https://www.drupal.org/files/issues/2918564-22.patch
patch -p 1 < 2918564-22.patch

diff --git a/page_manager.services.yml b/page_manager.services.yml
index 33bce44..f8fcf78 100644
--- a/page_manager.services.yml
+++ b/page_manager.services.yml
@@ -27,8 +27,10 @@ services:
     arguments: ['@entity_type.manager', '@path.current', '@request_stack']
     tags:
       # Run as late as possible to allow all other filters to run first.
-      - { name: non_lazy_route_filter, priority: -1024 }
+      # @todo Review this when https://www.drupal.org/node/2915772 is done.
+      - { name: route_filter, priority: -1024 }
       - { name: service_collector, tag: non_lazy_route_enhancer, call: addRouteEnhancer }
+      - { name: service_collector, tag: route_enhancer, call: addRouteEnhancer }
   page_manager.route_name_response_subscriber:
     class: Drupal\page_manager\EventSubscriber\RouteNameResponseSubscriber
     tags:
diff --git a/src/Routing/RouteEnhancerCollectorTrait.php b/src/Routing/RouteEnhancerCollectorTrait.php
index 0ca6c44..e91e4a3 100644
--- a/src/Routing/RouteEnhancerCollectorTrait.php
+++ b/src/Routing/RouteEnhancerCollectorTrait.php
@@ -7,24 +7,22 @@
 
 namespace Drupal\page_manager\Routing;
 
-use Symfony\Cmf\Component\Routing\Enhancer\RouteEnhancerInterface;
+use Drupal\Core\Routing\EnhancerInterface;
 
 /**
  * Provides a trait to make a service a collector of route enhancers.
- *
- * @todo Move to Symfony CMF in https://github.com/symfony-cmf/Routing/pull/155.
  */
 trait RouteEnhancerCollectorTrait {
 
   /**
-   * @var \Symfony\Cmf\Component\Routing\Enhancer\RouteEnhancerInterface[]
+   * @var \Drupal\Core\Routing\EnhancerInterface[]
    */
   protected $enhancers = array();
 
   /**
    * Cached sorted list of enhancers
    *
-   * @var \Symfony\Cmf\Component\Routing\Enhancer\RouteEnhancerInterface[]
+   * @var \Drupal\Core\Routing\EnhancerInterface[]
    */
   protected $sortedEnhancers = array();
 
@@ -35,12 +33,12 @@ trait RouteEnhancerCollectorTrait {
    * The order of the enhancers is determined by the priority, the higher the
    * value, the earlier the enhancer is run.
    *
-   * @param \Symfony\Cmf\Component\Routing\Enhancer\RouteEnhancerInterface $enhancer
+   * @param \Drupal\Core\Routing\EnhancerInterface $enhancer
    * @param int $priority
    *
    * @return $this
    */
-  public function addRouteEnhancer(RouteEnhancerInterface $enhancer, $priority = 0) {
+  public function addRouteEnhancer(EnhancerInterface $enhancer, $priority = 0) {
     if (empty($this->enhancers[$priority])) {
       $this->enhancers[$priority] = array();
     }
@@ -54,7 +52,7 @@ trait RouteEnhancerCollectorTrait {
   /**
    * Sorts the enhancers and flattens them.
    *
-   * @return \Symfony\Cmf\Component\Routing\Enhancer\RouteEnhancerInterface[]
+   * @return \Drupal\Core\Routing\EnhancerInterface[]
    *   The enhancers ordered by priority.
    */
   protected function getRouteEnhancers() {
@@ -70,7 +68,7 @@ trait RouteEnhancerCollectorTrait {
    *
    * The highest priority number is the highest priority (reverse sorting).
    *
-   * @return \Symfony\Cmf\Component\Routing\Enhancer\RouteEnhancerInterface[]
+   * @return \Drupal\Core\Routing\EnhancerInterface[]
    *   The sorted enhancers.
    */
   protected function sortRouteEnhancers() {
diff --git a/src/Routing/VariantRouteFilter.php b/src/Routing/VariantRouteFilter.php
index 0c271d8..b23bda8 100644
--- a/src/Routing/VariantRouteFilter.php
+++ b/src/Routing/VariantRouteFilter.php
@@ -1,17 +1,12 @@
 <?php
 
-/**
- * @file
- * Contains \Drupal\page_manager\Routing\VariantRouteFilter.
- */
-
 namespace Drupal\page_manager\Routing;
 
 use Drupal\Component\Plugin\Exception\ContextException;
 use Drupal\Component\Utility\NestedArray;
 use Drupal\Core\Entity\EntityTypeManagerInterface;
 use Drupal\Core\Path\CurrentPathStack;
-use Symfony\Cmf\Component\Routing\NestedMatcher\RouteFilterInterface;
+use Drupal\Core\Routing\FilterInterface;
 use Symfony\Cmf\Component\Routing\RouteObjectInterface;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\RequestStack;
@@ -25,7 +20,7 @@ use Symfony\Component\Routing\RouteCollection;
  * needs to be filtered. Here is where we run variant selection, which requires
  * gathering contexts.
  */
-class VariantRouteFilter implements RouteFilterInterface {
+class VariantRouteFilter implements FilterInterface {
 
   use RouteEnhancerCollectorTrait;
 
@@ -141,9 +136,9 @@ class VariantRouteFilter implements RouteFilterInterface {
           return $name;
         }
 
-        // Restore the original request attributes, this must be done in the loop
-        // or the request attributes will not be calculated correctly for the
-        // next route.
+        // Restore the original request attributes, this must be done in
+        // the loop or the request attributes will not be calculated correctly
+        // for the next route.
         $request->attributes->replace($original_attributes);
         $this->requestStack->pop();
       }
diff --git a/tests/src/Unit/VariantRouteFilterTest.php b/tests/src/Unit/VariantRouteFilterTest.php
index 1664fbb..ea60e91 100644
--- a/tests/src/Unit/VariantRouteFilterTest.php
+++ b/tests/src/Unit/VariantRouteFilterTest.php
@@ -14,7 +14,7 @@ use Drupal\Core\Path\CurrentPathStack;
 use Drupal\page_manager\PageVariantInterface;
 use Drupal\page_manager\Routing\VariantRouteFilter;
 use Drupal\Tests\UnitTestCase;
-use Symfony\Cmf\Component\Routing\Enhancer\RouteEnhancerInterface;
+use Drupal\Core\Routing\EnhancerInterface;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\RequestStack;
 use Symfony\Component\Routing\Route;
@@ -331,7 +331,7 @@ class VariantRouteFilterTest extends UnitTestCase {
     $this->currentPath->getPath($request)->willReturn('/path/with/1');
     $this->pageVariantStorage->load('a_variant')->willReturn($page_variant->reveal());
 
-    $route_enhancer = $this->prophesize(RouteEnhancerInterface::class);
+    $route_enhancer = $this->prophesize(EnhancerInterface::class);
     $this->routeFilter->addRouteEnhancer($route_enhancer->reveal());
     $result_enhance_attributes = $expected_enhance_attributes = [
       'foo' => 'bar',
@@ -375,7 +375,7 @@ class VariantRouteFilterTest extends UnitTestCase {
     $this->currentPath->getPath($request)->willReturn('/path/with/1');
     $this->pageVariantStorage->load('a_variant')->willReturn($page_variant->reveal());
 
-    $route_enhancer = $this->prophesize(RouteEnhancerInterface::class);
+    $route_enhancer = $this->prophesize(EnhancerInterface::class);
     $this->routeFilter->addRouteEnhancer($route_enhancer->reveal());
     $expected_enhance_attributes = [
       'foo' => 'bar',
@@ -436,7 +436,7 @@ class VariantRouteFilterTest extends UnitTestCase {
     $this->currentPath->getPath($request)->willReturn('/path/with/1');
 
     $expected_attributes = ['slug' => 1, '_route_object' => $route, '_route' => $route_name];
-    $route_enhancer = $this->prophesize(RouteEnhancerInterface::class);
+    $route_enhancer = $this->prophesize(EnhancerInterface::class);
     $route_enhancer->enhance($expected_attributes, $request)->willReturn(['slug' => 'slug 1']);
     $this->routeFilter->addRouteEnhancer($route_enhancer->reveal());