How to install typo3/cms-workspaces extension via composer in TYPO3 V9

Question

I have a TYPO3 V9 LTS installed via composer (as recommended in the tutorial), which working fine so far. Now I want to install the "workspaces" extension. This must be done via composer, too.

$ composer require typo3/cms-workspaces

All console lines are green, no errors occured, seems fine. But after login to the TYPO3 backend, the following error message appeared:

Doctrine\\DBAL\\Exception\\TableNotFoundException

An exception occurred while executing 'SELECT uid , title , adminusers , members FROM sys_workspace WHERE ( sys_workspace . deleted = 0) AND ( sys_workspace . pid = 0) ORDER BY title ASC': Table 'typo3_v9_testserver.sys_workspace' doesn't exist

I assume that composer didn't the same way to install an extension as the conventional TYPO3 backend would do (especial here create or extense DB tables). How to install the "workspaces" extension via composer?

Answer 1

Solution: Go to install tool (thanks to Aristeidis Karavas for comment above)

https://mytypo.com/typo3/install.php

Go to Maintenance -> "Analyse Database Structure".
There are a lot of CREATE TABLE statements.
Click on "Apply selected changes".