[horde] Horde_ErrorHandler errors

[Stuart C. Naifeh]

When I log in to a freshly installed Horde 5 system, I'm get a lot of the
following errors in my apache error log:


PHP Warning:  Invalid callback Horde_ErrorHandler::errorHandler, class
'Horde_ErrorHandler' not found in /usr/share/php/PEAR/Config.php on line
2038, referer: https://mail.myserver.com/login.php

I get about 12 of these when I first login, and then they stop. They
originate from various points in /usr/share/php/PEAR/Config.php or
/usr/share/php/PEAR/Registry.php, but although the source of the error
changes, the stack trace always looks like this:

1. {main}() /srv/horde/imp/index.php:0
2. Horde_Registry::appInit() /srv/horde/imp/index.php:18
3. Horde_Registry->pushApp() /usr/share/php/Horde/Registry.php:249
4. Horde_Core_LoginTasks->runTasks() /usr/share/php/Horde/Registry.php:1558
5. Horde_Core_LoginTasks->runTasks()
/usr/share/php/Horde/Core/LoginTasks.php:45
6. Horde_LoginTasks->runTasks() /usr/share/php/Horde/Core/LoginTasks.php:48
7. Horde_LoginTasks_Task_AdminCheck->execute()
/usr/share/php/Horde/LoginTasks.php:211
8. Horde_Core_Db_Migration->__construct()
/srv/horde/lib/LoginTasks/Task/AdminCheck.php:61
9. Horde_Autoloader->loadClass() /usr/share/php/Horde/Autoloader.php:0
10. Horde_Autoloader->_include() /usr/share/php/Horde/Autoloader.php:21

and sometimes:

11. include() /usr/share/php/Horde/Autoloader.php:76

Obviously from the stack trace, this is when logging in as an admin user.
If I login as a normal user, I only get the error only once, and the origin
is /usr/share/php/Services/Weather.php, with the following stack trace:

1. {main}() /srv/horde/services/portal/index.php:0
2. Horde_Core_Factory_BlockCollection->create()
/srv/horde/services/portal/index.php:31
3. Horde_Core_Block_Collection->__construct()
/usr/share/php/Horde/Core/Factory/BlockCollection.php:61
4. Horde_Block_Metar->__construct()
/usr/share/php/Horde/Core/Block/Collection.php:45
5. class_exists() /srv/horde/lib/Block/Metar.php:21
6. Horde_Autoloader->loadClass() /usr/share/php/Horde/Autoloader.php:0
7. Horde_Autoloader->_include() /usr/share/php/Horde/Autoloader.php:21

Did I do something wrong in configuring the system?