problem with csv upload

[Deffend-Net]

Hi,
I am trying Chamilo and face a problem with importing users from csv file. So i just downloaded sample file which is available in csv upload page and just tried to upload this sample file to the system and it failed. Of course later i tried different options ( like reducing number of columns or removing headers) and none worked. chamilo error logs under apache folder show that problem is related league vendor csv import function. but could not troubleshoot it. would be glad to get some comments. I am using php version 8.1 and chamilo version is 1.11.32 . My investigations show that downgrading php to version 7.4 would help, but php 7.4 is not secure, so in practice it is not an option.

thanks in advance.