I don't believe i have spaces anywhere. The exact command, except the username bit, is below
./jav-it download -c cookies.txt -o "/Users/username/dwhelper/jav-it_v1.7.3_linux/Jav" -i tash00239
I tried with quotes as well but getting the same error
./jav-it download -c "cookies.txt" -o "/Users/username/dwhelper/jav-it_v1.7.3_linux/Jav" -i "tash00239"