Symfony Fatal Error ErrorHandler.php

[qublibjohnny]

Steps to reproduce the issue

I accessed my website today and the following error was displayed on a white screen.

Fatal error: Uncaught Error: Class "Symfony\Component\ErrorHandler\ThrowableUtils" not found in /home/customer/www/mydomain.com/public_html/libraries/vendor/symfony/error-handler/ErrorHandler.php:563 Stack trace: #0 [internal function]: Symfony\Component\ErrorHandler\ErrorHandler->handleException(Object(Error)) #1 {main} thrown in /home/customer/www/mydomain.com/public_html/libraries/vendor/symfony/error-handler/ErrorHandler.php on line 563

Expected result

No changes have been made to my site, and I haven't updated anything. It appears to be intermittent, I've checked and it's now online again, but I've made no changes. Not sure why it's not working one minute, then suddenyl everything appears ok without any changes made.

I am able to login to the Joomla admin area ok.

When I check the administrator/logs/everything.php the most recent entry is below. I'm not sure if this is relevant?

2023-02-06T12:28:53+00:00 CRITICAL 207.46.13.160 error Uncaught Throwable of type Joomla\CMS\Router\Exception\RouteNotFoundException thrown with message "Page not found". Stack trace: #0 [ROOT]/libraries/src/Application/SiteApplication.php(736): Joomla\CMS\Router\Router->parse(Object(Joomla\CMS\Uri\Uri), true) #1 [ROOT]/libraries/src/Application/SiteApplication.php(224): Joomla\CMS\Application\SiteApplication->route() #2 [ROOT]/libraries/src/Application/CMSApplication.php(294): Joomla\CMS\Application\SiteApplication->doExecute() #3 [ROOT]/includes/app.php(61): Joomla\CMS\Application\CMSApplication->execute() #4 [ROOT]/index.php(32): require_once('/home/customer/...') #5 {main}

System information (as much as possible)

Joomla 4.2.5 and PHP 8.0.27

Additional comments

My webhost (siteground) have confirmed everything looks ok at their end, and suggested a restore from backup.

I'm reluctant to upgrade anything until I understand what's going on.

Any ideas?

[wilsonge]

The log, unfortunately is not relevant. That's just symptomatic of someone trying to access the Joomla api from a web browser and failing to match a route so won't be related to your administration access.

Your main error is unfortunately a fatal error thrown when trying to run the main error handler. Can you check there is a file in libraries/vendor/symfony/error-handler/ThrowableUtils.php

[qublibjohnny]

Yes, there is a file in libraries/vendor/symfony/error-handler/ThrowableUtils.php

The contents are below.

<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\ErrorHandler;

use Symfony\Component\ErrorHandler\Exception\SilencedErrorContext;

/**
 * @internal
 */
class ThrowableUtils
{
    /**
     * @param SilencedErrorContext|\Throwable
     */
    public static function getSeverity($throwable): int
    {
        if ($throwable instanceof \ErrorException || $throwable instanceof SilencedErrorContext) {
            return $throwable->getSeverity();
        }

        if ($throwable instanceof \ParseError) {
            return \E_PARSE;
        }

        if ($throwable instanceof \TypeError) {
            return \E_RECOVERABLE_ERROR;
        }

        return \E_ERROR;
    }
}

I haven't experienced this issue in a while, but I'd like to figure out why it happened if possible.

[joomdonation]

I'm afraid of something is broken in libraries of your Joomla installation makes that class not auto-loadable. If you really want to fix this issue, the best thing you can do in this case is updating your site to Joomla 4.2.8, then follow the instructions at https://ltheme.com/reinstall-core-files-in-joomla-4/ to re-install Joomla core files. That should address your issue

As this is something special with your Joomla installation, and not with Joomla core, I'm closing the issue. If you still need more help, try to use Joomla forum .

[qublibjohnny]

Hi @joomdonation

The same thing is happening on my site today. I have updated to 4.2.8 and reinstalled the core files. Same error.

Any ideas?

[joomdonation]

@qublibjohnny Sorry, I don't have any other idea. For this special case, I'm afraid of you will need to find a developer to help you to check and solve it

On my local Joomla installation, I even added some code to check to make sure that class Symfony\Component\ErrorHandler\ThrowableUtils is available and autoloadable, so must be something special on your site somehow.

[qublibjohnny]

@joomdonation Is this likely to be caused by something on my home page? A third party plugin?

I should add, this is only affecting my home page - all other pages are accessible.

I've also noticed that the http:// (non-secure) version of my home page loads ok.

[qublibjohnny]

Fixed. I had to enable 'force https' at the web server (siteground). The Joomla error message didn't help much though.

[davidascherG]

I'm seeing the same problem when attempting to access the Events Booking extension - Configuration. I don't go there often so I don't know when this problem may have begun. The problem existed with Events Booking v4.4.1 and and when I installed v4.4.2 nothing got any better. I already had "Force HTTPS" set for this domain in Siteground's admin dashboard. And it is also set at the JOOMLA Global Configuration level. SO that is clearly NOT the solution.

This is not going to be easy for somebody to figure out and fix because it is so difficult to reproduce - but it seems likely that it will take some bodies on the Joomla development team to do that.

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/39804.}

[davidascherG]

The exact error I saw was
Fatal error: Uncaught Error: Class "Symfony\Component\ErrorHandler\ThrowableUtils" not found in /home/customer/www/myhost.org/public_html/libraries/vendor/symfony/error-handler/ErrorHandler.php:563 Stack trace: #0 [internal function]: Symfony\Component\ErrorHandler\ErrorHandler->handleException(Object(TypeError)) #1 {main} thrown in /home/customer/www/myhost.org/public_html/libraries/vendor/symfony/error-handler/ErrorHandler.php on line 563

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/39804.}

[joomdonation]

@davidascherG The error from Configuration page of Events Booking is very likely comes from editor you are using. Or in some cases, causes by outdated Joomla language packages (sometime, after updating from Joomla 3 to Joomla 4, customers forgot to update language package and it causes fatal error in Code Mirror editor if I remember correctly, seen that few times during my support life)

If the issue could be seen on your site, could you please submit a support ticket at https://joomdonation.com ? I will try to take a look at it to see why there is fatal error with that class not found like that and hopefully, could come up with a solution.

[qublibjohnny]

@davidascherG I don't have Events Booking installed, although that is the exact same error I was seeing on my home page. Strangely, all my other pages were accessible (e.g. /about, /contact)

The only @joomdonation extension I have installed is OSMap (free).

Can this issue be re-opened as it's clearly a Joomla bug?

[joomdonation]

The only @joomdonation extension I have installed is OSMap (free)

That's not our extension :)

Just for information, I spent sometime today to check the site from @davidascherG but could not figure out the reasons yet. The php file is there, I tried to use class_exist function to check and it returns true when the code is run outside the file ErrorHandler but inside that ErrorHandler class, it return false for some reasons.

Really don't know what to do next, so strange. One thing is the site I checked is using PHP 8.0.x, maybe you can try to use a different PHP version like PHP 8.1 to see if the error still happens?

[qublibjohnny]

@joomdonation Apologies, I thought it was.

Just to clarify, my issue appears to be fixed, by forcing https on siteground. But, this still doesn't explain why it was happening, or the vague and misleading error message that I included above.

@davidascherG Appears to be seeing the exact same error, although seems to think it's related to Events Booking - an extension I don't have installed.

My site is running PHP 8.0.28

I could upgrade to 8.1, but if it resolves the issue, it still doesn't explain the cause. Wouldn't it be best if we could find the Joomla bug and resolve?