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9 votes
Accepted

Fatal error: require_once(): Failed opening | Use of undefined constant DS - assumed 'DS'

This is not coming from Joomla core, but from a 3rd party (likely custom developed) component that exist in your site. First see if you really need/use this component, or you can simply uninstall it. ...
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  • 19.5k
7 votes
Accepted

Fatal error: Call to a member function get() on Templates Manager

Well, a quick look inside the templates folder of the site, presented me the ugly truth - it seems that whoever did the upgrade, has never considered to clean up the site from old code/extensions/...
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  • 19.5k
5 votes

PHP error reporting

You'll want to create a custom PHP error handler and have that send you an email. You can use FILE and FUNCTION and LINE constants to load where the error happened into the email that you alert ...
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  • 531
4 votes

PHP error reporting

I've found out that the easiest/faster method to resolve this was to use a script reading apache's logs and send a mail every day with a summary. FYI : Server's setup has a daily log rotation, run ...
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  • 263
3 votes
Accepted

PHP Fatal error: Class 'ContentHelperRoute' not found

I just came across this issue again with another site and remembered what the problem is. This module is that it has changed the way it's loading its helper File/Class and the way the helper.php file ...
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  • 19.5k
3 votes
Accepted

Class not found in Joomla 4 when using JDate inside a function

I’m answering the question because it is obviously not a Joomla 4 core bug but a mistake in the developer’s coding and the problem would be the same in Joomla 3 too. If you try to use a Joomla core ...
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  • 2,436
3 votes
Accepted

How to make manual re-installation of Joomla! Core without losing extensions?

It seems your Joomla! instance is corrupted. Since using the Joomla admin does not help with the re-installation, I would suggest Do a complete Joomla! Core manual re-installation / package ...
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  • 19.5k
3 votes

Fatal error: require_once(): Failed opening | Use of undefined constant DS - assumed 'DS'

I recommend you to use this plugin: http://extensions.joomla.org/extension/ds-constant it will reintroduce the deprecated DS constant to ease the migration for 2.5.x sites whose extensions still use ...
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2 votes

Fatal Error in JModuleHelper

This is one funny problem. It seems that Joomla includes code from module template overrides in a manner that certain variable names do affect the core JModuleHelper renderModule function. All you ...
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2 votes

Backend menu administrator GUI broke

The screenshot you posted make me think that there must be a Fatal Error somewhere. Enable error_reporting to see if any exists and where it comes from. Most likely it will be an outdated extension, ...
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  • 19.5k
2 votes

Blank Page after restoring a site on localhost from a backup

Almost every time there is a blank page on a php application, it denotes a php fatal error somewhere. It's not uncommon, it happens and there can be many reasons for it. Troubleshooting tips Error ...
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  • 19.5k
2 votes

Joomla administrator error Call to a member function isAdmin() on null

I recommend running a backup and then upgrading to the latest version of Joomla (currently v3.6.5). If this does not fix the issue, then try the "Reinstall Joomla core files" option in the Joomla ...
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2 votes
Accepted

Issues updating from Joomla 3.4.8 to 3.6.5

We don't have the full information and historical of your site and it's not clear if the update you have is prior to any update attempts. Also, it's not clear if any of your issues existed before your ...
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  • 19.5k
2 votes
Accepted

Persistent problem with Joomla cache

Switch to conservative caching, progressive caching should be avoided. You will run into all sorts of issues because of progressive caching, including, but not limited to, memory issues and file ...
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  • 3,176
2 votes
Accepted

Fatal Error: Class 'ArticlesLatestHelper' not found in Joomla 4 module while trying to add new function

Either, include that helper class on the top of your default.php like: defined('_JEXEC') or die; use Joomla\Module\ArticlesLatest\Site\Helper\ArticlesLatestHelper; Then you can use that class ...
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  • 2,436
2 votes

How to solve include_once() Warnings in tmp directory after migration?

It appears that you don't yet have your file path properly declared. I'll offer some instructions to correct your tmp path, but you should execute the same technique to eliminate the other Warnings ...
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  • 4,388
2 votes

How to solve include_once() Warnings in tmp directory after migration?

These are not Errors, these are only Warnings (or is there also any error message connected to these particularly?). This warning usually happens when (due to ie. migration) a file path was changed ...
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  • 2,436
2 votes
Accepted

0 Call to a member function purgePrivate() on null

This is from Litespeed Cache. It is somehow related to the Joomla Login. You can test this is true by uninstalling the Litespeed Cache plugin. I went into cPanel and I went to Terminal and I did a ...
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  • 1,819
1 vote

"ERROR 504 - GATEWAY TIMEOUT" in Joomla! 'Administrator' Only

This issue also exists in Gantry4 templates. Below is the fix for that: if (!class_exists('JDocumentRendererHead')) { require_once(JPATH_LIBRARIES.'/joomla/document/html/renderer/head.php'); }
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1 vote

Error displaying the error page: Call to undefined method JAdminCssMenu::addChild()

This is a known issue but isn't related to Joomla. Other people have also ran into the same error, and it's due to SP Page Builder Pro More information can be found on it here: https://www....
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  • 26.4k
1 vote

Joomla Update 3.7.3 has broken my website. AbstractApplication.php error

I turned on maximum error reporting and chased the problem down to "Modules Anywhere" component. The upgrade destroyed that component. I couldn't wait for days on the component's message board for an ...
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1 vote

Joomla Update 3.7.3 has broken my website. AbstractApplication.php error

I tried to visit your site but sucuri says that my country is blocked, so I can't see more about the error. You can try re-installing Joomla from the admin (Joomla Update component) - or try a manual ...
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  • 19.5k
1 vote
Accepted

Fatal error in K2 Tools Module

I have changed: require_once (dirname(__FILE__).DS.'helper.php'); To: require_once (dirname(__FILE__).'/'.'helper.php'); This is a known bug and an official solution should be given in the next K2 ...
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1 vote

Fatal error: Cannot redeclare class JEditor

It seems that there is another place that you have the class "JEditor" defined. If you have shell (ssh) access to your server, try running the below under your Joomla directory: grep -R --include=*....
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  • 3,176
1 vote

How to override Joomla input.php(JFilterInput class)

It is strange that it return "Notice: Array to string conversion". It usually means that you try to get array variable using string functions. Check what data do you push directly in $_REQUEST. Back ...
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1 vote

Joomla 3.4.3 get fatal error while opening plugins

For anyone that might end up here through a Google search, trying to find a solution to a similar problem: Usually fatal errors especially after an update may mean that some files didn't copied over ...
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  • 19.5k
1 vote

How to fix Joomla site both frontend and backend shows error page (site down) after fix database?

If you're in case of a failed upgrade you can check out this tutorial to manual upgrade a Joomla Installation. https://gist.github.com/mbabker/d7bfb4e1e2fbc6b7815a733607f89281 It sometimes helps ...
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1 vote

How to fix Joomla site both frontend and backend shows error page (site down) after fix database?

Since you have an Akeeba backup, I would use their Akeeba Kickstart offering to restore the server. Akeeba Kickstart is a downloadable ZIP file which when uploaded to the server along with the JPA ...
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  • 1,396
1 vote

I am getting Error on Sucuri Mallware scan on Joomla for SectionCategoryArticleList component

Looks like the variable $params isn't getting set. Could be several reasons this is happening, among them that there isn't a menu item set in the current URL. As @lodder noted, this is old code. The ...
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  • 802
1 vote

Fatal error: require(): Cannot redeclare class mailtohelper

instead of require ('file_path_here'); try using require_once('file_path_here'); Whenever you need any file to be included in the current page then remember, require() includes file that ...
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Only top scored, non community-wiki answers of a minimum length are eligible