After Upgrade - No Login

NC is installed in Version which came from config.php After Upgrade, i cant login, Website is reloading. I got no error.
Any idea?

Please use the search function of this forum and you will find several similar issues which are most likely being caused by missing or wrong php modules. Check the web server and Nextcloud log files for further information.

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is searched but all solutions i found didnt work for me. Log to file is activated, but with level3 empty. In Apache Webserver Log i cant find errors.