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English
I had 2.9.0 and tried to upgrade, it seems the upgrade process to 2.10.1 did not upgrade ALL of the files.
I looked at upgrade.php and it was seeking the maximum version 1.5.2, so the upgrade.php was leftover from 2.9.0.
The remedy was to perform a manual upgrade of Piwigo and nuke the half-baked upgrade.
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