Fetch email error

Your software
My Mautic version is: 3.3.3
My PHP version is: 7.3
My Database type and version is:

Your problem
My problem is: fetch email using cli error. but on mautic configuration shows success!

might be important
the muatic is on vps. and I want to fetch email from cpanel

These errors are showing in the log:

[2021-08-26 09:38:19] mautic.NOTICE: Symfony\Component\Debug\Exception\FatalThrowableError: Call to undefined function Mautic\EmailBundle\MonitoredEmail\imap_search() (uncaught exception) at /home/page/public_html/app/bundles/EmailBundle/MonitoredEmail/Mailbox.php line 558 while running console command mautic:email:fetch
[2021-08-26 09:38:19] mautic.WARNING: Command mautic:email:fetch exited with status code 1

Steps I have tried to fix the problem: change email multiple time