[Wien] Error in LAPW2

[sufyan]

Dears developers and users

  i run WIEN2K (11.1) for my case and it has converged successfully the sfc
using the commands "Manually" ,but when i want calculate the DOS either
using w2web or the commands
i have this
  Error in LAPW2
 'LAPW2' - can't open unit: 18

 'LAPW2' -        filename: aflamno3-2.vsp

 'LAPW2' -          status: old          form: forma

i need any suggestions for treat this problem
 thanks
sufyan naji
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