Error when migrating content from Typo3 4.5.15 to 12 composer

TYPO3 Questions Installation
1

Hello Everyone,

I am new to Typo3. I want to migrate the content and the template from an old server (4.5.15) to a new Typo3 (v12) instance I created with composer.

I followed the documentation for importing things with composer. (link: Migration steps — TYPO3 Upgrade Guide main documentation).

  1. Exporting worked: I have a configuration .xml and a content backup .t3d
  2. Importing does not: It throws an error that I have not installed the: wt_twitter and the css_styled_content extensions, however, these extensions do not exist anymore.

I am unsure how to proceed

  1. Set Up a new template? Will this prevent importing the .t3d backup later?
  2. Adjust my .xml config?
  3. Manually rework the old packages?

Any advice, tips or approaches are appreciated!

2

Hi!

Welcome to TYPO3!

The quickest thing is probably to set extensionDependencies to an empty array within the .t3d file or create empty extensions to represent wt_twitter and css_styled_content during the import.

The wt_twitter extension looks like it was abandoned many years ago, so you won’t be able to use it anymore.

css_styled_content was replaced by fluid_styled_content in TYPO3 v8.6.

PS! Even if you’re new, it sounds like the website you are upgrading is a few years old. 4.5.15 was released twelve years ago, so it’s great to hear your site is being upgraded! A lot has happened in the TYPO3 world over those years, so if upgrading directly proves difficult, try upgrading to some intermediary versions. It’s usually good to upgrade from version n to max n+2 in each step.

— Mathias