Call to undefined method Joomla\CMS\Application\SiteApplication::getConfig()

Dear Support Team,
I get the exact same error after updating:

"CALL TO UNDEFINED METHOD JOOMLA\CMS\APPLICATION\SITEAPPLICATION::GETCONFIG()"

Our website is now down:
stingl-klavier.at

Joomla!-Version 3.10.12 Stable
PHP-Version 8.2.25-bookworm.0

Thank you for your kind assistance.

The site works! Thank you for the promptness! It was fantastic!

Just for your information: Our Website is still on Joomla3, as most of our pages are built with JSN Pagebuilder. As this company closed, and there are no further updates, I need to rebuild all the old pages with your Pagebuilder.
After that, I will update to Joomla 5.

Dear Toufiq,
Though most of the sites work now, I still found some errors:

"0
CALL TO A MEMBER FUNCTION GETPARAMS() ON NULL"

This happens when I try to open some sites like:
https://www.stingl-klavier.at/index.php?option=com_sppagebuilder&view=page&id=15

If I use the preview button in the page builder, I get the same error.
BUT if I open the side via menu link (front-end), it opens fine.

Thanks again for your support.

Hi,
with the last patch (3) I still had a blank page for whatever the page.

Fatal error: Declaration of JoomShaper\SPPageBuilder\DynamicContent\Model::offsetExists(JoomShaper\SPPageBuilder\DynamicContent\mixed $offset): bool must be compatible with ArrayAccess::offsetExists($offset) in /administrator/components/com_sppagebuilder/dynamic-content/Model.php on line 419

I'm with joomla 3.10.12 with PHP 7.4.33
The issue is related to PHP 8's type declarations in the ArrayAccess interface implementation.
Fix is to modify the Access interface methods (offsetGet, offsetSet, offsetUnset) by removing the 'mixed' type hint from their parameters.

So in Model.php I 've changed to :

    public function offsetExists($offset): bool
    {
        return isset($this->item->$offset);
    }

    public function offsetGet($offset): mixed
    {
        return $this->item->$offset;
    }

    public function offsetSet($offset, $value): void
    {
        $this->item->$offset = $value;
    }

    public function offsetUnset($offset): void
    {
        unset($this->item->$offset);
    }

And now it's ok

But still can't acces SP Page Builder Administration (500 error)
Regards

Hi Toufiq,

I will, but for now the :

Fatal error: Declaration of JoomShaper\SPPageBuilder\DynamicContent\Model::offsetExists(JoomShaper\SPPageBuilder\DynamicContent\mixed $offset): bool must be compatible with ArrayAccess::offsetExists($offset) in /administrator/components/com_sppagebuilder/dynamic-content/Model.php on line 419

Is not fix in SP PB 5.5.1 so blank page remain on front side.
PHP 7.4.33

Nope,

three of my website are still under joomla 3.10.12, and needs PHP 7.4.33

You just need to apply the fix that I've provided.

If not, I'll stay with SP PB 5.4.6 for those

What we are missing here is a pop-up to warn us that we need to upgrade PHP first, as stated in the SPPB PRO technical requirements.

Regards

Yes already check.
I'll stay with SP PB 5.4.6 for those J3