Administrator Multiple Classes not found - Forward Facing Site ok

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Joomla! Apprentice
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Administrator Multiple Classes not found - Forward Facing Site ok

Post by noideajase » Thu Dec 02, 2021 4:49 am

Hi Guys,

Joomla version 3.10.0

The front end (public facing side of the site) is faultless so the issue is isolated to the side only
Almost every menu item (link) on the Administrator Control Panel I select results in one of the following:
Class 'JFormFieldList' not found
Class 'JFormFieldPredefinedList' not found
Class 'JFormFieldGroupedList' not found
Call to a member function order() on null

I have attempted using the Forum Post Assistant however after file extraction and upload to the root folder and navigating to it hangs for some time then results in a 500 - Internal Server Error (for clarity the site url loads with no issue - only the FPA results in a 500 Response).

The site is running on a shared hosting environment with host managed PHP versions currently PHP 7.4.26
I have tried rolling back the php version but this has not helped.

I am not sure if I have at some stage accidentally deleted a file or there are corruption issues (I use C-panel and an ftp client to manage this and a number of other sites).

As a first step if I can understand where these classes which are being called should be located I might be able to work out what is going on.

I have also attempted a complete rollback however I only have access to previous 30 days backup and using the oldest backup (database and files) did not resolve the issue.

results of

<extension version="3.6" type="file" method="upgrade">
<author>Joomla! Project</author>
<copyright>(C) 2019 Open Source Matters, Inc.</copyright>
<license>GNU General Public License version 2 or later; see LICENSE.txt</license>
<creationDate>August 2021</creationDate>
<schemapath type="mysql">administrator/components/com_admin/sql/updates/mysql</schemapath>
<schemapath type="sqlsrv">administrator/components/com_admin/sql/updates/sqlazure</schemapath>
<schemapath type="sqlazure">administrator/components/com_admin/sql/updates/sqlazure</schemapath>
<schemapath type="postgresql">administrator/components/com_admin/sql/updates/postgresql</schemapath>
<server name="Joomla! Core" type="collection"></server>

phperror.log [dates and times removed]

PHP Warning: count(): Parameter must be an array or an object that implements Countable in /home/customer/www/ on line 371

PHP Warning: Invalid argument supplied for foreach() in /home/customer/www/ on line 587

Any suggestions would be appreciated.
Cheers Jase

PS have tried searching for similar issues on here, a Google search and on

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