Nobody can help me? 
sry, i would help if i knew anything about mapping for prey but...
did you try finding help on other forums or maybe mapping tutorials especially for prey mapping? look everywhere you can
Did you change anything in the "base" folder?
Apart from Psyshokiller and a couple other users, almost no one user Radiant over here! 
Maybe try to ask in this community, which is more "ID" games related: http://www.levelmakers.com/community/index.php
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