the text edit keeps adding a .rtf after the .cfg ????
Like the others before, I don't see anything obvious jump out at me from your config file. So, I have another angle of attack. The best way to avoid this type of "\auto-rename" issue is to enclose your file name in double quotes ("") in the "Save As" dialogue, like so: "biomegen.cfg". This tells the editor to save the file as-is. My guess is that changing a plain txt into rich text format might have added extra encoding. And this is perhaps causing errors.
So, delete your existing biomegen.cfg and start from scratch and use the double quotes enclosing suggestion. Additionally, if you can choose the file type to save as in your editor, choose "text format" instead of "rich text". Typically, this option is just under the input box where you type file name.
P.S: I am not on a Mac, so the option might be (slightly) different for you. Just explore a little bit.
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keep going.