Leantime install : internal server error 500

Hi

I want to setup leantime on a shared hosting but i have no success doing it.

My my pointing are configured as follow:
Domain,com --> /root/myblog
Subdomain,domain,com --> /root/leantime/public

I have renamed config/configuration.sample.php to config/configuration.php as recomanded

I also set value of :
public $appUrl = “leantime.domain.com”; //Base URL, trailing slash not needed

I tested :
Leantime,domain,com/install
leantime,domain,com/index.php?install=true

Both give error 500
Please help me to solve the issue

My error.log is as follow:

[12-May-2021 18:31:23 America/Los_Angeles] PHP Warning: require_once(…/vendor/autoload.php): failed to open stream: No such file or directory in /hermes/bosnacweb05/bosnacweb05bj/b306/ipg.bekraoui1266451/root/leantime/src/core/class.autoload.php on line 43
[12-May-2021 18:31:23 America/Los_Angeles] PHP Fatal error: require_once(): Failed opening required ‘…/vendor/autoload.php’ (include_path=’.:/usr/share/php’) in /hermes/bosnacweb05/bosnacweb05bj/b306/ipg.bekraoui1266451/root/leantime/src/core/class.autoload.php on line 43
[12-May-2021 18:32:00 America/Los_Angeles] PHP Warning: require_once(…/vendor/autoload.php): failed to open stream: No such file or directory in /hermes/bosnacweb05/bosnacweb05bj/b306/ipg.bekraoui1266451/root/leantime/src/core/class.autoload.php on line 43
[12-May-2021 18:32:00 America/Los_Angeles] PHP Fatal error: require_once(): Failed opening required ‘…/vendor/autoload.php’ (include_path=’.:/usr/share/php’) in /hermes/bosnacweb05/bosnacweb05bj/b306/ipg.bekraoui1266451/root/leantime/src/core/class.autoload.php on line 43