Most common issues using Joomla
Sometimes Joomla users may encounter some issues. This tutorial will review the most common ones, explain what causes them and how to fix these errors.
This database error can be resolved by checking the configuration.php file in your Joomla folder and making sure that the following lines are written correctly.
var $dbtype = 'mysql';
var $host = 'localhost';
var $user = 'user_jo151';
var $password = 'YourPassword';
var $db = 'user_jo151';
var $ dbprefix = 'jos_';
You should make sure you are using the correct MySQL username and database in your configuration.php file. In order to check the correct MySQL username and database you can use the MySQL database in your cPanel.
404 page not found
This error might be caused by the database itself. In order to resolve this issue you should start with restoring your database. This error can also be caused by Joomla SEO functionality. If the website looks fine but still continues to give you a “404 page not found” error, open the configuration.php file and edit the var $ live _site=“; to match the actual URL of your website. Log in as an administrator to your Joomla website and make sure that Search Engine Friendly URLs and Apache mode re-write are set to yes.
XMLS file missing in the package
This error occurs when installing a new template. If this happens you should check if it is compatible with your current version of Joomla.
404 Component not found
You should check if your default menu item is published in the front page. Joomla needs a default item to do this. Go to the admin area then to the menu and select the item you want to be loaded when you are at your main page and click at the default button on your top right.
MySQL server has gone away
This often happens when you try to install a big extension and use FTP to do this. You can find a way around this through the administrative area. Go to Global Configuration>Settings>FTP settings. Change ‘Enable FTP’ from yes to no. Now you can try and re-install the extension again.