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Joomla 3.2.2 with guestbook version 3.02, K2 is installed. Server info, CENTOS 5.10, Apache 2.2.7, mySQL 5.5.37-cll, PHP 5.4.3

Simply clicking on the "Guestbook" link in the Joomla backend throws the error in the subject of this post. Detailed info:

JForm::getInstance could not load file
Call stack
# Function Location
1 JApplicationCms->execute() JROOT/administrator/index.php:42
2 JApplicationAdministrator->doExecute() JROOT/libraries/cms/application/cms.php:255
3 JApplicationAdministrator->dispatch() JROOT/libraries/cms/application/administrator.php:143
4 JComponentHelper::renderComponent() JROOT/libraries/cms/application/administrator.php:98
5 JComponentHelper::executeComponent() JROOT/libraries/cms/component/helper.php:332
6 require_once() JROOT/libraries/cms/component/helper.php:352
7 JControllerLegacy->execute() JROOT/administrator/components/com_categories/categories.php:25
8 CategoriesController->display() JROOT/libraries/legacy/controller/legacy.php:722
9 CategoriesViewCategories->display() JROOT/administrator/components/com_categories/controller.php:95
10 JError::raiseError() JROOT/administrator/components/com_categories/views/categories/view.html.php:48
11 JError::raise() JROOT/libraries/legacy/error/error.php:253

I have checked the permissions, removed the component and reinstalled, all to no avail. Any help would be greatly appreciated.

Hi, if I see the error log, I don't see any part in the list which is related to guestbook, hmmm, really no idea what can be wrong there. If you enable php error reporting (https://www.phoca.cz/documents/16-joomla ... rs-on-site), do you get any php error there?

Jan

Thank you for the reply. I couldn't see anything directly related to Guestbook either but it is the only component exhibiting this error. I will double check permission once more.

No change in the Joomla backend screen when PHP error reporting is enabled as described in the link provided.

The php-error log file has these last two entries: I am no expert by any means but I don't think the error log relates to this problem. Thanks again for any help or tips that may resolve this issue.

There must have been an unknown problem in my installation of Joomla core. Steps taken to fix:

On the same server created a new user account and installed a clean copy of Joomla.
Added Guestbook as the first component.
Added each additional component and then checking GB for errors or conflicts - NONE.
Used rsync to copy file content and chown to set ownership.
Used a PHP script to set permissions on folders and files.
Exported / Imported database.
Edited configuration.php to reflect new settings, reset perms.

This was a "brute force" fix but was less time consuming that trying to debug the real issue.

Ok