Thread:Project:Support desk/Command Line Installation Of Extension On Subdomain/reply (4)

The first error is an attempt to call a function that's not defined. MysqlUpdater::dropExtensionIndex &mdash;in fact, it's defined at DatabaseUpdater)&mdash; was introduced on MediaWiki 1.21. Maybe you're running an older MediaWiki version (less than 1.21) but with the latest code of ConfirmAccount? Please make sure you download the extension from the exact version of MediaWiki you're running.

The second error is because the update.php script failed before the required tables were created. You should address the first error.