Error function

I've got a problem with an error function. I would like to compute error function with complex argument. I know that it isn't possible with erf(x) function. Few months ago (when I have Octave 3.0.x) I downloaded erfz(z) which could compute error function with complex inputs. Now when I have newest Octave it's impossible. I obtain error massage:
error:
error: called from:
error:  ~/erfz.m at line 20, column 4
It's possible to compute error function with complex inputs in newest Octave?