Manual:Common errors and symptoms

You see a Blank Page

 * A blank white page indicates a PHP error which isn't being printed to the screen. To force this, add the following lines to the LocalSettings.php file, underneath the &lt;?php:


 * You can also set a value for error_log in PHP.ini and read the PHP error log to find out what's going on. In some cases, PHP errors might also be recorded in the web server error log.

Image Thumbnails not working and/or appearing

 * Try flipping ImageMagick off in LocalSettings.php and just letting it use GD for the convert.
 * Ensure that your $wgImageMagickConvertCommand variable is valid. Common settings are:
 * $wgImageMagickConvertCommand = "/usr/bin/convert";
 * $wgImageMagickConvertCommand = "/usr/local/bin/convert";

Error selecting database wikidb: 1044 Access denied for user 'username'@'localhost' to database 'wikidb'

 * You need to Grant permissions on wikidb.* - See Manual:Installation
 * or if you're Web Server is on a different box than your DB server - you have to configure remote access to MySQL and grant differently
 * NOTE: Replace 192.168.0.x with your Webserver's IP
 * NOTE: Replace 192.168.0.x with your Webserver's IP
 * NOTE: Replace 192.168.0.x with your Webserver's IP

Could not find a suitable database driver!

 * PHP MySQL support is not installed/enabled - See http://www.php.net/manual/en/ref.mysql.php

Sorry! We could not process your edit due to a loss of session data. Please try again. If it still doesn't work, try logging out and logging back in.

 * Assuming you get this error even when you do have a seemingly valid logon session:
 * Check to see if your session.save_path value in php.ini is valid and writable to the webserver - PHP configuration.

Fatal error: Allowed memory size of xxxxxxx bytes exhausted (tried to allocate xxxx bytes)

 * Raise PHP's memory limit in php.ini: memory_limit = 32M      ; Maximum amount of memory a script may consume (32MB)