Warning: Class 'Drupal\Core\StringTranslation\TranslatableMarkup' not found in /home/cohistor/showcase/core/includes/bootstrap.inc on line 50

Fatal error: Uncaught Error: Interface 'Stringable' not found in /home/cohistor/showcase/core/lib/Drupal/Component/Render/MarkupInterface.php:32 Stack trace: #0 /home/cohistor/showcase/vendor/composer/ClassLoader.php(576): include() #1 /home/cohistor/showcase/vendor/composer/ClassLoader.php(427): Composer\Autoload\{closure}('/home/cohistor/...') #2 [internal function]: Composer\Autoload\ClassLoader->loadClass('Drupal\\Componen...') #3 /home/cohistor/showcase/core/lib/Drupal/Component/Render/FormattableMarkup.php(61): spl_autoload_call('Drupal\\Componen...') #4 /home/cohistor/showcase/vendor/composer/ClassLoader.php(576): include('/home/cohistor/...') #5 /home/cohistor/showcase/vendor/composer/ClassLoader.php(427): Composer\Autoload\{closure}('/home/cohistor/...') #6 [internal function]: Composer\Autoload\ClassLoader->loadClass('Drupal\\Componen...') #7 /home/cohistor/showcase/core/lib/Drupal/Core/StringTranslation/TranslatableMarkup.php(21): spl_autoload_call('Drupal\\Componen...') #8 /home/cohistor/showcase/vendor/compos in /home/cohistor/showcase/core/lib/Drupal/Component/Render/MarkupInterface.php on line 32