Notice: Use of undefined constant SORTARRIVAL - assumed 'SORTARRIVAL' in /hd1/www/horde/imp/config/prefs.php on line 919

Notice: Use of undefined constant SORTARRIVAL - assumed 'SORTARRIVAL' in /hd1/www/horde/imp/config/prefs.php on line 923

Notice: Use of undefined constant SORTDATE - assumed 'SORTDATE' in /hd1/www/horde/imp/config/prefs.php on line 924

Notice: Use of undefined constant SORTFROM - assumed 'SORTFROM' in /hd1/www/horde/imp/config/prefs.php on line 925

Notice: Use of undefined constant SORTTO - assumed 'SORTTO' in /hd1/www/horde/imp/config/prefs.php on line 926

Notice: Use of undefined constant SORTSUBJECT - assumed 'SORTSUBJECT' in /hd1/www/horde/imp/config/prefs.php on line 927

Notice: Use of undefined constant SORTSIZE - assumed 'SORTSIZE' in /hd1/www/horde/imp/config/prefs.php on line 928

Warning: register_shutdown_function() [function.register-shutdown-function]: Invalid shutdown callback 'imap_errors' passed in /hd1/www/horde/imp/lib/base.php on line 145

Warning: register_shutdown_function() [function.register-shutdown-function]: Invalid shutdown callback 'imap_alerts' passed in /hd1/www/horde/imp/lib/base.php on line 146

Notice: Use of undefined constant OP_HALFOPEN - assumed 'OP_HALFOPEN' in /hd1/www/horde/imp/lib/Block/tree_folders.php on line 26

Notice: Undefined index: log in /hd1/www/horde/lib/Horde.php on line 49
A fatal error has occurred
Auth_imp: Required IMAP extension not found.

[line 44 of /hd1/www/horde/imp/lib/Auth/imp.php]
Details (also in Horde's logfile):

object(PEAR_Error)#16 (8) {
  ["error_message_prefix"]=>
  string(0) ""
  ["mode"]=>
  int(1)
  ["level"]=>
  int(1024)
  ["code"]=>
  NULL
  ["message"]=>
  string(44) "Auth_imp: Required IMAP extension not found."
  ["userinfo"]=>
  NULL
  ["backtrace"]=>
  array(8) {
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    array(7) {
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      ["class"]=>
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            ["class"]=>
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            ["object"]=>
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            int(1259)
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                    ["url"]=>
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                    array(1) {
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                      string(4) "ingo"
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                  }
                  ["ingo"]=>
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                    string(7) "Filters"
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                    ["url"]=>
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                    string(36) "/horde/ingo/themes/graphics/ingo.png"
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                ["_root_nodes"]=>
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        ["callback"]=>
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      ["type"]=>
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            string(10) "horde_main"
          }
          ["_sortCriteria"]=>
          NULL
          ["_usesession"]=>
          bool(true)
          ["_static"]=>
          bool(false)
        }
        [1]=>
        &int(0)
        [2]=>
        &string(3) "imp"
      }
    }
  }
  ["callback"]=>
  NULL
}