Fehler Mailer IMAP Error

Dump:

Array
(
    [error] => Laminas\Mail\Storage\Exception\RuntimeException: cannot change folder, maybe it does not exist in /var/www/html/vendor/laminas/laminas-mail/src/Storage/Imap.php:384
Stack trace:
#0 /var/www/html/vendor/laminas/laminas-mail/src/Storage/Imap.php(199): Laminas\Mail\Storage\Imap->selectFolder()
#1 /var/www/html/classes/Components/MailClient/Client/ImapMailClient.php(82): Laminas\Mail\Storage\Imap->__construct()
#2 /var/www/html/cronjobs/tickets.php(93): Xentral\Components\MailClient\Client\ImapMailClient->connect()
#3 /var/www/html/cronjobs/command.php(218): include('...')
#4 {main}

Next Laminas\Mail\Storage\Exception\RuntimeException: cannot select INBOX, is this a valid transport? in /var/www/html/vendor/laminas/laminas-mail/src/Storage/Imap.php:201
Stack trace:
#0 /var/www/html/classes/Components/MailClient/Client/ImapMailClient.php(82): Laminas\Mail\Storage\Imap->__construct()
#1 /var/www/html/cronjobs/tickets.php(93): Xentral\Components\MailClient\Client\ImapMailClient->connect()
#2 /var/www/html/cronjobs/command.php(218): include('...')
#3 {main}
    [account] => Xentral\Modules\SystemMailer\Data\EmailBackupAccount Object
        (
            [id] => 4
            [displayName] => 
            [emailAddress] => suppliers.info@rieger-energietechnik.ch
            [descrption] => 
            [username] => SRieger
            [password] => **********
            [server] => imap.mail.hostpoint.ch
            [imapIsSentFolderActive] => 
            [imapSentFolder] => Sent
            [imapPort] => 993
            [imapType] => 3
            [letterTemplateId] => 0
            [isAutoresponseActive] => 1
            [autoresponseSubject] => Ticket {TICKET}  to {BETREFF}
            [autoresponseText] => IN CASE OF AN ANSWER - PLEASE DO NOT ADJUST THE SUBJECT

Thank you for contacting us.

Your request has been forwarded and registered under the following ticket number: {TICKET}

We will try to contact you within the next two working days.
Thank you for your understanding and please do not hesitate to contact us if you have any further questions or concerns.

To ensure a quick and timely response to your request, please reply directly to this e-mail.
            [autoresponseLimitEnabled] => 
            [projectId] => 0
            [isBackupEnabled] => 
            [backupDeleteAfter] => 0
            [addressId] => 0
            [companyId] => 0
            [isDeleted] => 
            [isTicketImportEnabled] => 1
            [isTicketDeleteEnabled] => 1
            [isTicketMarkAsFinishedEnabled] => 1
            [ticketQueueId] => EK-suppliers.info
            [ticketProjectId] => 0
            [isTicketInboundEmailAddressEnabled] => 1
            [ticketStartDate] => 0000-00-00
            [isSmtpEnabled] => 
            [smtpServer] => asmtp.mail.hostpoint.ch
            [smtpSecurity] => ssl
            [smtpPort] => 465
            [smtpSenderEmail] => suppliers.info@rieger-energietechnik.ch
            [smtpSenderName] => 
            [smtpAuthType] => smtp
            [smtpAuthParam] => suppliers.info@rieger-energietechnik.ch
            [smtpDebugEnabled] => 
            [clientAlias] => 
            [isSignatureEnabled] => 
            [signatureText] => Best regards,

Rieger 

            [signatureMutex] => 0
        )

)