fast accurate Kneser sexp algorithm

[JmsNxn]

Sheldon, I'm wondering if I'm doing something wrong here, but whenever I try to plot anything with this function:

Code:

V(a,b,t) = {
  if (real(t)<1,  return(exp2(t,exp2(-t,a)+exp2(-t,b))));
  if (real(t)>=1, return(exp2(t,exp2(-t,a)+exp2(-1,b))));
}

exp2(t, a) = {
  if (a==2, return(2));
  if (a == 4, return(4));
  if (real(a)>2, return(superf(isuperf(a)+t)), return(superf2(isuperf2(a)+t)));
}

I repeatedly get a cryptic Win32 error:

Code:

gp 4852 child_copy: linked dll data write copy failed

This is my proposed "natural" extension to the Ackermann function, I'm confused as to why it won't plot.

I appreciate any help you can give me, thanks.