[TYPO3-debian] Upgrade 7.6.23 -> 8.7.x

[Simon Temp]

HI!

On Debian Stretch, PHP 7.0.27 I try to upgrade Typo3. I use git to update the Typo3 directory.

After upgrade to any 8.x.x version I got errors in my logs and white pages - even if I have deleted cache and/or typo3temp/*.

The error is:

"PHP Fatal error:  Class 'TYPO3Fluid\Fluid\View\TemplateView' not found in /opt/typo3/typo3/sysext/fluid/Classes/View/AbstractTemplateView.php on line 28"

I am totally lost here. Can you give me some tips?

Thanks in advance!