ReflectionException error appears at Drupal 8 project when I am going to clear cache

Question

When I going to clear cache from admin panel, error appears:

The website encountered an unexpected error. Please try again later.ReflectionException: Class Drupal\mymodule\Controller\MyClass does not exist in ReflectionMethod->__construct() (line 136 of core/lib/Drupal/Core/Entity/EntityResolverManager.php). Drupal\Core\Entity\EntityResolverManager->setParametersFromReflection(Array, Object) (Line: 221)

But at my local system there is no error.

I did some R & D with it. I found some difference between my local phpinfo and server phpinfo. Found different between. Different found at Reflection property.

For my local there display some version of Reflection , but at server no version found.

Local:

Server:

Answer 1

Best way to use created controller under the src like (modules/yourmodule/src/Controller/xyzController.php).

Rout path will be:

yourmodule.payrs:
  path: '/thank-you'
  defaults:
    _title: 'Thank You'
    _controller: '\Drupal\yourmodule\Controller\xyzController::abc'
  requirements: 
    _permission: 'access content'
  options:
    no_cache: 'TRUE'

Good luck.