I have same problem. I can delete the language, but i can’t add or edit ones.
Evo 1.0.4 YAMS 1.1.9
I think I found the problem areas. When I want to add or edit the language I have a field for "Server Name", but if I fill it (insert "(site.com)") - I get an error. But if I leave the field "Server Name" blank - everything works fine.
I have had the same problem. Manual creation of yams.config.inc.php helped in my case.
YAMS is not supported anymore guys, there are other CMS’s that do multi-lingual out of the box with ease...u might consider this as a once off.
you need to leave the erver Nam field empty. that had caused my issue as well.