Critical error on installing assets in v9.0.0 to v9.0.1 upgrade

[skinnybloke]

I am trying to upgrade from Prestashop v9.0.0 to v9.0.1

I am using PHP 8.4 and v7.4.3 of the upgrade assistant. I have tried this with 3rd party modules and overrides enabled and disabled,

The file and database updates completed correctly, but I get this error when trying to install assets.

INFO - CoreUpgrader - Database update OK
[2025-10-21 12:35:03] INFO - CoreUpgrader - Installing assets
[2025-10-21 12:35:03] CRITICAL - ErrorHandler - /home/sites/testsites/domains/testnv/modules/autoupgrade/classes/UpgradeTools/CoreConsoleExecutable.php line 74 - Symfony\Component\ErrorHandler\Error\UndefinedFunctionError: Attempted to call function "exec" from namespace "PrestaShop\Module\AutoUpgrade\UpgradeTools".
#0 /home/sites/testsites/domains/testnv/modules/autoupgrade/classes/UpgradeTools/CoreConsoleExecutable.php(45): PrestaShop\Module\AutoUpgrade\UpgradeTools\CoreConsoleExecutable->getBaseCommand()
#1 /home/sites/testsites/domains/testnv/modules/autoupgrade/classes/UpgradeTools/CoreUpgrader/CoreUpgrader.php(890): PrestaShop\Module\AutoUpgrade\UpgradeTools\CoreConsoleExecutable->callCommand('assets:install ...')
#2 /home/sites/testsites/domains/testnv/modules/autoupgrade/classes/UpgradeTools/CoreUpgrader/CoreUpgrader.php(124): PrestaShop\Module\AutoUpgrade\UpgradeTools\CoreUpgrader\CoreUpgrader->installAssets()
#3 /home/sites/testsites/domains/testnv/modules/autoupgrade/classes/Task/Update/UpdateDatabase.php(73): PrestaShop\Module\AutoUpgrade\UpgradeTools\CoreUpgrader\CoreUpgrader->finalizeCoreUpdate()
#4 /home/sites/testsites/domains/testnv/modules/autoupgrade/classes/Task/Runner/ChainedTasks.php(66): PrestaShop\Module\AutoUpgrade\Task\Update\UpdateDatabase->run()
#5 /home/sites/testsites/domains/testnv/**admin_folder**/autoupgrade/ajax-upgradetab.php(58): PrestaShop\Module\AutoUpgrade\Task\Runner\ChainedTasks->run()
#6 {main}

 

If I refresh the screen or reopen the update assistant, the screen tells me that v9.0.1 has been installed correctly.

Any ideas?