[Tickets #14833] Error when communicating with the server with PDF Attachements

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Ticket URL: https://bugs.horde.org/ticket/14833
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  Ticket             | 14833
  Created By         | Klaus.Steinberger at physik.uni-muenchen.de
  Summary            | Error when communicating with the server with PDF
                     | Attachements
  Queue              | IMP
  Version            | 6.2.22
  Type               | Bug
  State              | Unconfirmed
  Priority           | 3. High
  Milestone          |
  Patch              |
  Owners             |
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Klaus.Steinberger at physik.uni-muenchen.de (2018-07-10 12:45) wrote:

Since the update to 6.2.22 emails with PDF Attachements will not load,  
with the error: "Error when communicating with the server". In the  
horde log this is logged:

2018-07-10T14:17:28+02:00 EMERG: HORDE [imp] Undefined class constant  
'ALPHACHANNEL_REMOVE' [pid 7681 on line 142 of  
"/var/www/html/horde/imp/lib/Mime/Viewer/Pdf.php"]

This happens both with pecl imagick versions 3.3.0 and 3.4.3 on a  
CentOS 7.5 system