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Error ReflectionException: Class DynamicPageCacheSubscriber does not exist in ReflectionClass->__construct()

I got this error on my website with drupal 8.1 and php 7.4

The website encountered an unexpected error. Please try again later. ReflectionException: Class Drupaldynamic_page_cacheEventSubscriberDynamicPageCacheSubscriber does not exist in ReflectionClass->__construct() (line 30 of /var/www/html/surveyapp/core/lib/Drupal/Core/DependencyInjection/Compiler/RegisterEventSubscribersPass.php). ReflectionClass->__construct() (Line: 30) DrupalCoreDependencyInjectionCompilerRegisterEventSubscribersPass->process() (Line: 140) SymfonyComponentDependencyInjectionCompilerCompiler->compile() (Line: 789) SymfonyComponentDependencyInjectionContainerBuilder->compile() (Line: 1335) DrupalCoreDrupalKernel->compileContainer() (Line: 916) DrupalCoreDrupalKernel->initializeContainer() (Line: 477) DrupalCoreDrupalKernel->boot() (Line: 707) DrupalCoreDrupalKernel->handle() (Line: 19)

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Error ReflectionException: Class DynamicPageCacheSubscriber does not exist in ReflectionClass->__construct()

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