Error when using Parallel import command | MTC Extendee Custom Import Bundle Plugin

Your software
My Mautic version is: v4.4.9
My PHP version is: 8.0.29
My Database type and version is: 10.6.12-MariaDB-0ubuntu0.22.04.1
Doctrine driver: pdo_mysql
|Doctrine database platform: Doctrine\DBAL\Platforms\MariaDb1027Platform

Your problem
My problem is: We are having issues with the parallel import command from MTCExtendee’s Mautic Custom Import Bundle plugin.

sudo php /mautic/bin/console mautic:import:parallel

The command is being executed from the console, but seems to return the below error:

[2023-07-25 15:42:37] mautic.NOTICE: Error: Class "Symfony\Component\Process\ProcessBuilder" not found (uncaught exception) at /srv/mautic/docroot/plugins/MauticCustomImportBundle/Import/ParallelImport.php line 42 while running console command `mautic:import:parallel` [] {"hostname":"not_the_real_hostname","pid":47673}

Steps I have tried to fix the problem:
Clearing cache and restarting server

@kuzmany one for you!