If you played a few games with bots then Realbot makes the ini files, otherwise they aren't there. My program automatically creates ini files with random values, and tells you about it, and if you go to the same bot again you shouldn't get the message. Just because the bot is in rb_names.txt doesn't mean an ini file has been created for it.

If you keep getting the message for the same bot, something is wrong. Maybe the directory/files are read only, I don't know.