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Drupal\Core\Database\DatabaseExceptionWrapper: SQLSTATE[HY000]: General error: 1267 Illegal mix of collations (ascii_general_ci,IMPLICIT) and (utf8mb4_general_ci,COERCIBLE) for operation '=': SELECT "name", "data" FROM "config" WHERE "collection" = :collection AND "name" IN ( :names__0 ); Array ( [:collection] => [:names__0] => contact.form.Ecole d'été franco-germano-polonaise "Triangle de Weimar" ) in Drupal\Core\Config\DatabaseStorage->readMultiple() (line 111 of core/lib/Drupal/Core/Config/DatabaseStorage.php).