Hello @Antonio !

You may try to launch the following commands in your UNA database managing panel:

RENAME TABLE `sys_storage_tokens` TO `sys_storage_tokens_old`;
CREATE TABLE IF NOT EXISTS `sys_storage_tokens` (
 `iid` int(11) NOT NULL AUTO_INCREMENT,
 `id` int(11) NOT NULL,
 `object` varchar(64) NOT NULL,
 `hash` varchar(32) NOT NULL,
 `created` int(10) unsigned NOT NULL,
 PRIMARY KEY (`iid`),
 UNIQUE KEY `id` (`id`,`object`,`hash`),
 KEY `created` (`created`)
);

And check the work of your UNA site. If it is OK - then drop the `sys_storage_tokens_old` table.