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Common Issues
Issue
Resolution
Emails are imported twice when using PHP_IMAP Fetch
This usually happens when there is more than one cron entry, and can be fixed by keeping the main/default WHMCS cron entry only
[WHMCS Application] ERROR: Error: Call to undefined function imap_open()
This usually happens when 'IMAP_OPEN' function is missing in PHP. Make sure IMAP is installed correctly. Also, this could be an issue with the CRON invoking wrong PHP (e.g. if invoking CRON from web works fine)
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