Process Email Posts

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Sorry about this question if it is already posted somewhere, but I couldn't find it on this forum.
I am having a problem with running processing email posts job. I am getting the following error:
Class 'Concrete\Core\Mail\Importer\Zend_Mail_Storage_Imap' not found

Not sure if this is a known issue or there is something I am missing?

Version:
Concrete 5.7.4.2


Thanks in advance.

unixtime