Problems with PHP 8


when I switch my PHP version to 8.0 I get always problems:

Core: Exception handler (WEB): Uncaught TYPO3 Exception: #1476107295: PHP Warning: Undefined array key “namespaces.” in /…/Typo3/typo3_src-11.5.10/typo3/sysext/frontend/Classes/Http/RequestHandler.php line 358 | TYPO3\CMS\Core\Error\Exception thrown in file /…/Typo3/typo3_src-11.5.10/typo3/sysext/core/Classes/Error/ErrorHandler.php in line 137. Requested URL:

I cleaned a few times the cache, deinstalled all 3rd partie extensions totally, but it keeps going on.

I found a link to TYPO3 Exception 1476107295 — TYPO3 Exceptions main documentation, but I think the TCA is made by the programm and the extensions not by me.

Typo3. v11.5.10 - PHP v8.0.16

Best regards