FADAL ERROR "HELIX TOO SHORT" USING GIBBSCAM

I'm milling a mold with 9.6168 groove in it.Using a 9/64 ball mill.Mold will be used to produce custom O-ring.Fadal 904-1 VMC.
The mold is on a 12" x 12" piece of A-2
Pretty simple program,depth of mold is only .070.
However I keep getting "Helical Radius too small" error.I'm fairly new to Fadal but have many years of CNC experience.
Not doing anything fancy,just ramping onto part till it gets to final depth and 1 spring pass.

Can someone please explain this error?

Is it a Fadal thing or Gibbscam thing

Any help would be much appreciated.

Merry Christmas!!