Call to undefined function cache_invalidate() in D:\WebServers\XAMPP\htdocs\fa24\admin\db\maintenance_db.inc on line 248

.

Have informed the devs a few days ago but the fix has not been incorporated yet.

During installation, after filling in the db parameters, on submission, there is an error due to recent inclusion of the function cache_invalidate() in FA 2.4's includes/session.inc, without including it in the install/isession.inc file.

The fix is to append the following snippet of code to install/isession.inc:

/*
 Ensure file is re-read on next request if php caching is active
*/
function cache_invalidate($filename)
{
 if (function_exists('opcache_invalidate')) // OpCode extension
  opcache_invalidate($filename);
}