[Wien] lapw2 error

[ben amara imen]

I work on supercell.when i optimize the cell's volume , the following error
appears:
Error in LAPW2
 'FERMI' - EFERMI OUT OF ENERGY RANGE
 'FERMI' - STOP IN EFI
 'FERMI' - ENERGY OF LOWER BOUND                 :
0.46445
 'FERMI' - NUMBER OF STATES AT THE LOWER BOUND   :
51.69435
 'FERMI' - ENERGY OF UPPER BOUND                 :
0.46445
 'FERMI' - NUMBER OF STATES AT THE UPPER BOUND   :
51.69438
 'FERMI' - ADD
51.03704
 'FERMI' - SOS
0.0000.0000.0000.0000.0000.0000.0000.0000.0000.000
 'FERMI' - NOS
**************************************************
 what means ?? can you help me please
thanks in advance
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