After generating k points grid with open_grid.x, when i do pw2wan, i
encounter an error  like
  numk=         144  iknum=          38

This could happen if the list of k-points that you provide to "wannier90.x -pp" is not the same that was produced by open_grid.x

Did you copy the list of k-points printed from open_grid.x verbatim into the input of wannier90, and only afterward run "wannier90.x -pp" ?

hth

--

Dr. Lorenzo Paulatto
IdR @ IMPMC - CNRS UMR 7590 & Sorbonne Université
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http://www.impmc.upmc.fr/~paulatto/ - https://anharmonic.github.io/
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