There seems to have been an error initializing or updating
The default value 1.25e7 is too small for many modern cameras. The default settings may limit your pages to less than 10k or 64k in size.The problem is solved in all currently supported versions of Media Wiki (see task T60640).See report: Topic: Rz2zo0m88rrxqrfn and Thread: Project: Support_desk/Media Wiki_don't_work_with_PCRE_8.34_(2) First, determine your $wg SVGConverter setting.Many people report blank pages in recent versions after submitting articles to their new wiki. This change does not require you to restart apache.A likely cause is the memory limit in default php installations (usually 8 MB). If the page just hangs loading during some time (like 30 seconds) doing a specific action, and then it results in a blank page or HTTP 500 error, the problem is a timeout connecting to some server.If you receive the error "Error occurred during initialization of VM, Could not reserve enough space for object heap, Could not create the Java virtual machine.", try increasing the value of $wg Max Shell Memory. For more information see the comments on PHP: imagecreatefromjpeg (function synopsis) Assuming you get this error even when you do have a seemingly valid logon session: If your Apache server has the Hardened PHP patch, you may need to edit several variables in your /etc/file if you wish to have wiki pages with large amounts of content.On some Linux and BSD installations rsvg is renamed: Instead of setting (default) One cause: the number of pixels in the original image exceeding $wg Max Image Area. In particular, consider the settings for varfilter.max_value_length, max_value_length, and hphp.request.max_value_length.By default, it is set to use Image Magick for conversion. Ensure that your $wg Image Magick Convert Command variable is valid.
Optionally with those error messages: This is caused by a change in PCRE 8.34.You need to update Media Wiki to a supported version.When the path is missing non-ASCII characters When using IIS/Fast CGI on Windows, the guest account that is used also needs execute permission on %SYSTEMROOT%\System32\otherwise you'll receive an "Unable to Fork" error.Media Wiki places time and memory limits on shell commands under Linux.
This may be the database server, or if it happens doing a specific action, the mail server (if you have configured email settings).
If it's the email server, check if you can connect to it from the server running Media Wiki, for example, running the Telnet client to the server and port configured on $wg SMTP and seeing if it can connect.