Autoload.php missing

[Strizz02]

Hello,
I try to install COPS on a Proxmox-LXC with Debian. Although I chose 'the easiest way' for the installation described in the manual I did not succeed in getting COPS to run. My problem is the following error message in the error.log:

2021/01/05 09:43:13 [error] 1932#1932: *3 FastCGI sent in stderr: "PHP message: PHP Warning: require_once(/var/www/ebooks/vendor/autoload.php): failed to open stream: No such file or directory in /var/www/ebooks/config.php on line 9PHP message: PHP Fatal error: require_once(): Failed opening required '/var/www/ebooks/vendor/autoload.php' (include_path='.:/usr/share/php') in /var/www/ebooks/config.php on line 9" while reading response header from upstream, client: 192.168.178.105, server: ebooks., request: "GET / HTTP/1.1", upstream: "fastcgi://unix:/var/run/php/php7.3-fpm.sock:", host: "ebooks."

I know there where other users who had the same problem, but they installed COPS 'from sources'. Therefore the proposals are not quite practical for me. I downloaded the first zip-file of the assets (cops-1.1.3.zip) and extracted it in my web folder. Correct?
Where can I find the autoload.php file? Where does it come from?

Any Idea how I can solve the problem?

[marioscube]

In a terminal type:

ls -l /var/www/ebooks/vendor

Then post the output here

[Strizz02]

@marioscube: I have no folder /ebooks/vendor! Obviously I mixed something up. There are two files named cops-1.1.3.zip under assets. I don't know why but must have chosen the 2nd one (source code). This zip-file does not contain a folder vendor. Therefore the error message. I will make a second try with the first zip-file.
Thank you very much for your help.

[wikiped]

The vendor folder is not part of repository therefore only available when you download zip file from releases page. If you clone repository or download master.zip as suggested in README.md the error is WILL appear.