Optional prompt giving error in universe

Hi All,

I am trying to create optional prompt in Universe.  I am getting parsing error. Can any one plz correct this error.

Trunc(@Prompt('Enter state values','A','Store\State',multi,free,not_persistent,,' ',optional))

parsing error shows:

Parse failed: Invalid defination (UNV00023), Error parsing default values parameter (7th parameter).

Thanks,

Poorna