I'm Antonio from Italy and I'm new in this forum

I had download and installed a Timetrex for Debian Linux 11.
the installation was successfully completed, but when i try to login for first time i received the pop-up error:
"invalid CSRF Token, please refresh your browser and try again".
I have cancelled all token in the browser, but the error isn't solved.
in the file timetrex.ini.php I have enabled the row: "enable_csrf_validation = TRUE"
but not solved.
the version of timetrex is: TimeTrex_Community_Edition_15.3.3
OS Debian 11
PHP 8
have any idea to resolve this issue?
Thanks a lot, and sorry form my bad English
By Antonio