Selam alaykum friend,
Exactly what launcher are you using?
I use http://www.armaholic.com/page.php?id=410
and I get the same "horizon..." error message. It doesnt seem to effect anything that i know of...
And I'm sorry, but I dont quite understand what you mean.
Does the map work, and are you trying to fix the error message?
Does the map not work at all?
I hope i can help, and sorry for my English!