[Wien] Effective Mass

[delamora]

Dear WIEN2k community,

I am trying to calculate the "Effective Mass"
I am doing the example "GaAs" that is in the article;

Perturbation approach to ab initio effective mass calculations
Computer Physics Communications 261 (2021) 107648

In section "2.3. Sample work flow"

After doing the GaAs.struct file I do the following instructions;
init_lapw -b -vxc 13 -rkmax 7 -numk 500
run_lapw -ec 0.00001 -cc 0.0001
save_lapw -d noSOC
init_so_lapw
run_lapw -ec 0.00001 -cc 0.0001 -so
x lapw1
x lapwso
ln -sf GaAs1.vsp GaAs1.vspup
ln -sf GaAs1.vsp GaAs1.vspdn
ln -s case.vectorso case.vectorsoup
cp /home/Programas/WIEN2k/SRC_templates/case.inop GaAs1.inop
x optic -so -up

x mstar -up -settol 0.00001

*** Here I get an error;
 Detected input arguments = 2
 Input mommat file = ./GaAs1.mommat2up
 Degeneracy tolerance dEtol = 0.00001 [Ha]
 Confirming text-to-number conversion dEtol =  1.00000E-05 [Ha]
 The input file ./GaAs1.mommat2up was found.
  number of lines in mommat file = 0
 The file ./GaAs1.mommat2up is too short and most likely useless. Stopping
0.003u 0.008s 0:00.01 0.0%    0+0k 0+0io 0pf+0w

Saludos

Pablo
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