Problem on https://docs.typo3.org/m/typo3/reference-coreapi/main/en-us//ExtensionArchitecture/HowTo/BackendModule/CreateModuleWithExtbase.html

[garvinhicking]

The docs are missing the deprecation of https://forge.typo3.org/issues/96903 and contain an outdated example with moduleTemplate->setContent() which has been removed in TYPO3v13.

Reported on https://forge.typo3.org/issues/105496 and moved here

[garvinhicking]

My answer in the ticket:

The old moduleTemplate API has been removed: https://docs.typo3.org/c/typo3/cms-core/main/en-us/Changelog/12.0/Deprecation-96903-DeprecateOldModuleTemplateAPI.html

Most likely you should be able to use:

 public function dashboardAction(): ResponseInterface
    {
        $moduleTemplate = $this->moduleTemplateFactory->create($this->request);
        $moduleTemplate->assign('someVar', 'someContent');
        return $moduleTemplate->renderResponse('MyTemplate');
    }

with an accompanying Layout file as outlined in https://docs.typo3.org/c/typo3/cms-core/main/en-us/Changelog/12.0/Feature-96730-SimplifiedExtbackendModuleTemplateAPI.html