Fatal error when new user loginto imp

[David Chang]

Got error when a new user first time loginto IMP.

A fatal error has occurred 
object(pear_error)(10) {
  ["error_message_prefix"]=>
  string(0) ""
  ["error_prepend"]=>
  string(0) ""
  ["error_append"]=>
  string(0) ""
  ["mode"]=>
  int(1)
  ["level"]=>
  int(1024)
  ["code"]=>
  NULL
  ["message"]=>
  string(79) "Could not open Maintenance_Task module
Maintenance_Task_rename_sentmail_monthly"
  ["debuginfo"]=>
  string(0) ""
  ["userinfo"]=>
  NULL
  ["callback"]=>
  NULL
}
[/usr/local/apache/horde/lib/Maintenance.php : 368] 


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