[Puke]

you definitly can have multi-word names in the systemnames.txt file. i know that SPACE and ' are both legal characters, but i dont know about other things. There may be a character limit, but i dont know what it is. the longest name in the devnull mod system names file is "Greater Plooriod Cluster"

your error may be because of a formatting problem. i think that the first line of the file must be a line of text (the name of a system) and i think the Last line of the file must me a blank line. (with no blank lines inbetween, or it will be read as the end of the file)