Breaking: #91562 - cObject TEMPLATE removed 

See forge#91562

Description 

The cObject TEMPLATE, used for rendering marker-based templates has been removed along with the PHP class \TYPO3\CMS\Frontend\ContentObject\TemplateContentObject.

The successor FLUIDTEMPLATE is widely used since TYPO3 v7, and acts as a replacement for marker-based templates.

Impact 

Using TypoScript with page.10 = TEMPLATE will result in a PHP error when rendering the frontend.

Referencing the PHP class will result in a fatal PHP error.

Affected Installations 

TYPO3 installation still using TEMPLATE cObject in their TypoScript.

Migration 

Refactor TypoScript templates to not use the cObject TEMPLATE anymore.

In case you can not or want not make the switch to FLUIDTEMPLATE, install the extension modern_template_building from the official TYPO3 Extension Repository at https://extensions.typo3.org/, which acts as a drop-in replacement, and also ships the cObject FILE which is highly useful for TEMPLATE cObjects.

The extension is compatible with TYPO3 v9+.