[R] Problem/bug with smooth.spline and all.knots=T

[Hubertus]

Dear list,
if I do
  smooth.spline(tmpSec, tmpT, all.knots=T)
with the attached data, I get this error-message:
  Error in smooth.spline(tmpSec, tmpT, all.knots = T) :
        smoothing parameter value too small
If I do
  smooth.spline(tmpSec[-single arbitrary number], tmpT[-single arbitrary number], all.knots=T)
it works!

I just don't see it. It works for hundrets other datasets, but not for this one.
Would be glad if anyone could help!

Hubertus