[Wien] lapw2 error

[ben amara imen]

Hello,

I'm working on a  magnetic compound . I do the SCF (runsp_lapw) and it went
well. Then to calculate the DOS, I executed the command ''x lapw2-qtl'' but
I have this error in lapw2 !! :

Error in LAPW2
   'LAPW2'  -            can't open unit 18
  'LAPW2'                        filename :  case.vsp
  'LAPW2'                         Status    : old      form : formatted


what can I do to overcome my probleme , can someone helps me please and
Thanks in advance

Best  Regards
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