This article is for Flatfile's Portal 3.0. If you'd like to check out the latest version of the Flatfile Data Exchange Platform, click here!

Some of our users have reported errors that look like some variation of this following image while building Portals with PHP:

You may have received an error indicating that your index.php file is missing from your directory. The index.php file is necessary for a PHP build. If you are missing this file, or if it is located in the wrong directory, you should run the `composer install` command. This should install the appropriate files in the appropriate directories as well as any necessary packages.