xTB, GFN2-xTB open-shell calculations

[AndresOrtegaGuerrero]

Dear DFTB+ community,

I was wondering if you could help me with something? How can I enable open-shell systems calculations while using GFN2-xTB ?? I used this option,

SpinPolarisation = Colinear {
UnpairedElectrons = 3.0
InitialSpins = {
AtomSpin = {
        Atoms = 1:3
        SpinPerAtom = 1.0}
}
}

I keep getting this error -> Missing child: SpinConstants

How can I get these constants for different transition metals or lanthanides?
Or how can I get the simulations to run?

thank you

best,

Andres