In the "server" folder you find "authserver.conf" and "worldserver.com",
open it and be sure that "logDir"(under AUTH SERVER SETTING) and "Datadir" (CONNECTIONS AND DIRECTORIES) have the right path:
es. for logDir:
LogsDir = "C:\Users\...\Desktop\Prince Repack\Wow EMU 434 v2\server\logs"
es. for Data:
DataDir = "C:\Users\...\Desktop\Prince Repack\Wow EMU 434 v2\server\data"