@Catalin_Vrabie I see your journal have deposited some issues, so I’ll close this topic.
@jiamcs Your problem is different, your server is outputting an extra space in the beginning of the response and this is breaking some expectations (XML content cannot have empty spaces in the beginning), open this URL in your browser view-source:http://jiamcs.centre-univ-mila.dz/index.php/jiamcs/gateway/plugin/PLNGatewayPlugin and you’ll see the first line has an empty line.
I’ll probably address it in this issue: Investigate the message "The PKP PLN does not know about this journal yet" · Issue #8 · pkp/pkppln · GitHub, but anyway, it’s better to fix your OJS, someone probably edited one of the files and left empty spaces in the beginning