It means your registry settings for civ4 aren't normal and need to be fixed. See the FAQ. The installer looks at the registry to find where civ4 is installed; I'd allow you to enter the path yourself, but there is no way to change the message from "select where you want Star Trek to be installed" to "where is BtS installed" and more people get confused about what to enter (or enter the wrong thing and then complain the mod doesn't work) than have to use regedit.
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