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I'm helping a client with getting their website ready for PHP8. After doing the update to the latest Joomla and making sure the template is updated, it runs fine on PHP8. I do however get the following error only on one page. The page where you have to create a new user:

Error: Failed opening required 
'/usr/www/users/kznden/libraries/joomla/document/html/renderer/head.php' (include_path='.:/usr/share/php'): Cannot access offset of type string on string

I know this path doesnt exist anymore but how can I get rid of this error and the page working again? I opened the error.php file and believe the error is related to that file. If I'm wrong, please correct me. Specifically the following code:

$doc->setTitle($this->error->getCode() . ' - '.$this->title);
require_once(JPATH_LIBRARIES.'/joomla/document/html/renderer/head.php');
$header_renderer = new JDocumentRendererHead($doc);
$header_contents = $header_renderer->render(null);

Removing

require_once(JPATH_LIBRARIES.'/joomla/document/html/renderer/head.php');

doesn't seem to fix the issue.

enter image description here

Improve this question
9
  • Can you post a screenshot of the error, does Joomla have any error logs available? Commented Oct 12, 2022 at 12:19
  • What have you tried to resolve the problem properly? Which of these lines causes the error? Commented Oct 12, 2022 at 12:26
  • This error is not thrown in your provided code. Commented Oct 12, 2022 at 12:27
  • Does this answer your question? PHP message: PHP Fatal error: Uncaught TypeError: Cannot access offset of type string on string Commented Oct 12, 2022 at 12:27
  • Not sure of the image link shows. I cant yet add an image. Guess I'm too much of a new user yet. But basically the first piece of code in my post is what opens on the page. If I then edit any of the code it doesn't make a difference. I'm really at a loss. On PHP7.4 it works but as soon as I switch to PHP8 it gives the error. Commented Oct 12, 2022 at 15:09
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