Invalid service "dashboard.widget.t3extblog.latestPosts": class "TYPO3\CMS\Dashboard\Widgets\ListWidget" does not exist.

[julian-angermaier]

TYPO3 10.4.3
After installing it crashed my backend. Installtool gave me this message in "check for broken extensions"

(1/1) Symfony\Component\DependencyInjection\Exception\RuntimeException
Invalid service "dashboard.widget.t3extblog.latestPosts": class "TYPO3\CMS\Dashboard\Widgets\ListWidget" does not exist.

Is this a general problem? it seems like the integration changed:
https://docs.typo3.org/c/typo3/cms-core/master/en-us/Changelog/10.4/Breaking-90660-RegistrationOfWidgetsChanged.html

Thank You

[fnagel]

Which version of t3extblog are you using? Did you update the extension or TYPO3?

Probably some cache related stuff as the mentioned breaking change has been adapted for the extension, see this commit: 77ae7aa

The "latestPosts" widgets works for me in multiple installations:

[fnagel]

Please try clearing the cache in the "maintenance module" and try to remove and add the widgets from the dashboard.

[julian-angermaier]

I got a fresh installed 6.0.0 and TYPO3 Installation too. It crashes my backend. Clearing cache via Installtool returns 500 and database compare shows this message.

[fnagel]

Just checked the yaml configuration keys and the related classes again. Looks good.

Did you install the core extension EXT:dashboard? See https://packagist.org/packages/typo3/cms-dashboard

[julian-angermaier]

Thank You, EXT:dashboard fixed the "problem".
A dependency to this extension would be good :)

[fnagel]

Nice! Yeah, it's in the "suggest" part of composer (https://github.com/fnagel/t3extblog/blob/master/composer.json#L47), but it seems this needs a proper fix. Not sure how, but I hope to get some helpful replies here: https://twitter.com/felixnagel/status/1265662692603367428

[fnagel]

Created a ticket here: https://forge.typo3.org/issues/91531