Found the solution:
I had to login to the database and run this sql:
CREATE TABLEwp_termmeta` (
meta_id bigint(20) unsigned NOT NULL AUTO_INCREMENT,
term_id bigint(20) unsigned NOT NULL DEFAULT ‘0’,
meta_key varchar(255) COLLATE utf8mb4_unicode_ci DEFAULT NULL,
meta_value longtext COLLATE utf8mb4_unicode_ci,
PRIMARY KEY (meta_id),
KEY term_id (term_id),
KEY meta_key (meta_key(191))
) ENGINE=InnoDB AUTO_INCREMENT=3255 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;`
