PHP Warning: is_file(): open_basedir restriction in effect. File(/typo3/LLL:EXT:core/Resources/Private/Language/locallang_general.xlf) is not within the allowed path(s):

[supercat1510]

I get the error message after install the extension
PHP Warning: is_file(): open_basedir restriction in effect. File(/typo3/LLL:EXT:core/Resources/Private/Language/locallang_general.xlf) is not within the allowed path(s): (/xxxxxxx/typo3conf/ext/reserve/Configuration/TCA/tx_reserve_domain_model_email.php line 4
If i change the file - i get the error:
Core: Exception handler (WEB): Uncaught TYPO3 Exception: Class 'JWeiland\Reserve\Domain\Model\Email' not found | Error thrown in file /var/www/vhosts/bluebrix.de/httpdocs-neu/typo3conf/ext/reserve/Configuration/TCA/tx_reserve_domain_model_email.php in line 107.

Typo3 10.4.17
PHP 7.4.29
Use with Symlinks
Tested Versions from 'reserve' 2.0.2 and 1.2.3