1) please include your affiliation to the message, as usually done by all 
people taking part to this forum

2) I would use more meaningful and explanatory subjects, this usually results 
in a faster and more appropriate answer

This being said, the code is complaining because a run with calculation = 
‘bands’ should follow a self-consistent or relax
run. The latter saves a number of files needed for the next calculations. Those 
files must exist and being accessible/readable
by the code when the band calculation run is started.

Maybe you either did not perform the scf run, or deleted some of the needed 
files, or else those files are stored in a directory
different from “./“ (as you specified in the outdoor variable) or with a prefix 
name different from that specified in the input
file you sent.

It is quite hard, if not impossible, to provide more help without more details.

Giovanni

PS in your run you might need to set the value of ecutrho (currently not 
specified) to a value larger than
its default, 4*ecutwfc, because you’re using PAW pseudo potentials

> On 22 Mar 2019, at 10:39, yasmin kani <[email protected]> wrote:
> 
> i have an error while running band structure calculation for InSb. i need a 
> clarification
> <insb.band.in><insbbandout>_______________________________________________
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-- 

Giovanni Cantele, PhD

CNR-SPIN
c/o Dipartimento di Fisica
Universita' di Napoli "Federico II"
Complesso Universitario M. S. Angelo - Ed. 6
Via Cintia, I-80126, Napoli, Italy

e-mail: [email protected]
            [email protected]
Phone: +39 081 676910
Skype contact: giocan74
Web page: https://sites.google.com/view/giovanni-cantele

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