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While installing Opigno the way described in the manuel without Composer, I receive the following message
Fatal error: Interface 'Drupal\Core\Cache\Context\CacheContextInterface' not found in [mywebsiteopignohomedir]/core/lib/Drupal/Core/Cache/Context/RouteCacheContext.php on line 13
Anyone an idea how to solve this?
Greetz viragom
version 2.8 installation
Thnx Nicolay
Unable to install your product