Archiving report issue – Weeks, months, years not working

Bonjour!

Thanks a lot for this ethical analytics.
Unfortunately everything looks to work fine except for the reports. I have all visitor logs, and can have the daily reports for each day, but as soon as I want to see weekly or monthly report I have no data at all.
I checked my DB and even invalidated with your extra plugin / manually emptied all the report tables (blob), but I still get no data and these errors (below). When I try to display again a weekly report, it doesn’t work but the related table in PhPmyAdmin has created many rows (so it seems to be working at the end???)

Background: I have PHP 7.X , OVH Pro, so I can’t update the settings of MySQL to increase max_allowed_packet. I don’t remeber exactly but I think I tried to install matomo manually before you relaeased the WP plugin, I didn’t manage to make it work, and I installed the WP plugin recently -in march (maybe there is a conflict with the old installation?). I’m not very technical I would need some help sorry.

Thank you ??

Diagnostics=
Dernière exécution d’archivage réussie error L’archivage s’est exécuté avec succès le Samedi 7 mars 2020 17:40:04 soit il y a 45 jours 11:33:22

Taille maximale des paquets warning Il est important de configurer une taille ‘max_allowed_packet’ dans votre base de données MySQL d’au moins 64MB. 32MB configuré en ce moment.

archive_main 2020-04-22 04:50:40 1 total errors during this script execution, please investigate and try and fix these errors. => CronArchive.php:602; CronArchive.php:595; CronArchive.php:330; Access.php:644; CronArchive.php:331; ScheduledTasks.php:225; class-wp-hook.php:285; class-wp-hook.php:311; plugin.php:544; wp-cron.php:138;

Trouleshooting / create the archiving reports =
Matomo Archive Warnings: ‘Empty or invalid response 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‘1 total errors during this script execution, please investigate and try and fix these errors.’
‘1 total errors during this script execution, please investigate and try and fix these errors.’