Additional uncaught exception thrown while handling exception.


Fatal error: Uncaught Error: Interface 'JsonSerializable' not found in /home/dbspdedu/public_html/core/lib/Drupal/Component/Render/MarkupInterface.php:32 Stack trace: #0 /home/dbspdedu/public_html/vendor/composer/ClassLoader.php(444): include() #1 /home/dbspdedu/public_html/vendor/composer/ClassLoader.php(322): Composer\Autoload\includeFile('/home/dbspdedu/...') #2 [internal function]: Composer\Autoload\ClassLoader->loadClass('Drupal\\Componen...') #3 /home/dbspdedu/public_html/core/lib/Drupal/Component/Render/FormattableMarkup.php(61): spl_autoload_call('Drupal\\Componen...') #4 /home/dbspdedu/public_html/vendor/composer/ClassLoader.php(444): include('/home/dbspdedu/...') #5 /home/dbspdedu/public_html/vendor/composer/ClassLoader.php(322): Composer\Autoload\includeFile('/home/dbspdedu/...') #6 [internal function]: Composer\Autoload\ClassLoader->loadClass('Drupal\\Componen...') #7 /home/dbspdedu/public_html/core/lib/Drupal/Core/Utility/Error.php(100): spl_autoload_call('Drupal\\Componen...') #8 /home/dbspdedu/public_html/c in /home/dbspdedu/public_html/core/lib/Drupal/Component/Render/MarkupInterface.php on line 32