Hi @joapreditor
There is a previous topic related to this error, you may refer to it. I am afraid most of your problems arise from your server configuration. If you are on a shared hosting, and especially when php runs in safe mode, you may get unexpected errrors. I’m afraid your OJS still can’t access tar command because exactly same errors exist in your php error log.
Perhaps from this point on, more skilled programmers can help you
By the way, the file in the picture is called tar.php, but it needs to be tar
Regards,