[Pw_forum] Problem with epsilon.x

[Bohdan Andriyevskyy]

Dear All,
when I try to calculate optical properties of my crystal (cluster) I 
obtain the following CRASH file:

  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
      task #         0
      from epsilon : error #         1
      ban band number
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

The previous pw.x run was successful. The corresponding input files and 
the last output file (epsilon) are attached. Please, advise me how to 
resolve this problem.

Regards,
Bohdan
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