Smart Update was unable to correctly clone your website

[atanet]

Hello,
i installed version 5.9.1-5836. While updating wordpress I get the error "Smart Update was unable to correctly clone your website"
I checked the logs and found this:

[2022-01-28 08:04:25.338] 28801:61f3934b92778 ERR [extension/wp-toolkit] Failed to generate screenshot for url 'https://xxxxxxxx/.wp-toolkit_O/', reason The screenshot service was unable to make screenshots. Request to the screenshot service has failed with the following error code: 424. Either screenshot service or the website itself is not available. Make sure that the website is working correctly and responding.
[2022-01-28 08:05:07.702] 28801:61f3934b92778 ERR [extension/wp-toolkit] Failed to generate screenshot for url 'https://xxxxxxxx/.wp-toolkit_O/', reason The screenshot service was unable to make screenshots. Request to the screenshot service has failed with the following error code: 424. Either screenshot service or the website itself is not available. Make sure that the website is working correctly and responding.
[2022-01-28 08:05:07.703] 28801:61f3934b92778 ERR [extension/wp-toolkit] All '2' attempts to take screenshot 'https://xxxxxxxx.it/.wp-toolkit_O/' was failed
[2022-01-28 08:05:12.675] 26519:61f395a84eee0 ERR [panel] Instance # does not exist
[2022-01-28 08:09:08.543] 28801:61f3934b92778 ERR [panel] Task failed: id=6218, pid=28801, type=ext-wp-toolkit-smart-update-instance, error=Smart Update was unable to correctly clone your website for further analysis. Please try again later.
[2022-01-28 08:09:08.544] 28801:61f3934b92778 ERR [panel] Smart Update was unable to correctly clone your website for further analysis. Please try again later.
[2022-01-28 08:09:09.656] 28801:61f3934b92778 ERR [panel] Long task executor: id=6218 completed with error: Smart Update was unable to correctly clone your website for further analysis. Please try again later.:
0: /usr/local/psa/admin/plib/Task/Async/Executor.php:46
        Task_Async_Executor->execute()
1: /usr/local/psa/admin/plib/scripts/task-async-executor.php:6

How can I solve? Thank you.