If you mean you can't launch two RuneMate clients, you can, though you don't need to. Load up 2 runescape clients, have 2 runescape accounts added into Spectre and you're free to run bots on both of your runescape clients.
Oh my bad, Its just a bad mac error. I found a fix thanks
Runemate would't allow me to open 2 rs client at a time because it would only let me open up 1 client with rune mate. It turns out I had to manually open 2 rs client for it to work.