[Wien] error

[ali betaouaf]

I have this error  !!!!! error in LAPW1 'INILPW' - can't open unit: 18 'INILPW' -        filename: essai.vsp 'INILPW' -          status: old          form: formatted 'LAPW1' - INILPW aborted unsuccessfully. Can someone tell me please what's can i do?!
thanks in advance 
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