I tried to simulate the MoSe2 mono-layer with a different percentage of vacancy for Se. And I want to have a phonon bandgap graph as well as Raman spectra for that. I have tried different ways of calculations (like LDA, GGA, with different pseudopotentials). The calculation ran completely but when it wanted to calculate phonon band structure and Raman spectra it didn’t give any output for them. Could anyone please help me with that.