ERROR 0 - Class 'FieldsHelper' not found in ...

[frdt]

Hi,
On a new fresh installation of joomla 4.0.3 and with astroid template (last version) I use cutsom fields and a joomla override for customization.
When launching a page where some custom fields are used I get :

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"ERROR 0 - Class 'FieldsHelper' not found in /var/www/fdth/data/www/www.floreffe900.be/templates/astroid_template_zero/html/mod_articles_category/upcoming-events.php:35"

The 35 line is bellow

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<?php $customFields = FieldsHelper::getFields('com_content.article', $item, true);

There no extensions installed, this is a only original joomla.
I try to use the default template casiopea and get the same error
Any ideas ?
Thx

[Per Yngve Berg]

This looks like Joomla 3.x code.

Report it to the Template Developer.

[carlitorweb]

Just add this to the top of that file, and should fix the issue. Is recommend though you contact the developer:

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use Joomla\Component\Fields\Administrator\Helper\FieldsHelper