Help with Ad-On PHP error

Developing with Concrete
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<?php namespace Concrete\Package\StaffDirectory\Job; use \Concrete\Core\Job\Job as AbstractJob; class CompleteImport extends AbstractJob { ----------------------------------------------------------------------------------------- I'm getting this error when running the script on line 5 PHP Fatal error: Uncaught Error: Class 'Concrete\Core\Job\Job' not found in /home/acc/public_html/packages/staff_directory/jobs/complete_import.php:5 Stack trace: #0 {main} thrown in /home/acc/public_html/packages/staff_directory/jobs/complete_import.php on line 5 ------------------------------------------------------ Can anyone help resolve please?????? is it a class error to do with the path? Nothing exists in \Concrete\Core\Job\Job
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A job developed for v8 needs updates for v9. The classes for the job and queue are different. Some Job functionality just doesn’t exist in v9. Ideally, it needs to be implemented as a Task for v9.

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Thanks John, Unfortunately the app purchased from the add ons store said that it was Version 9 ready. Maybe for upgrades and normal functions but not this import schedule.

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As an aside, a namespace beginning \Concrete\Core is in the /concrete/src directory