a problem about "An invalid set of cell vectors was specified. The determinant det(h) is too small"

[anyu... at gmail.com]

Dear all,

I want to do the cell_opt for the 4X4X2 graphite, but the output file 
always showed that" An invalid set of cell vectors was specified. The 
determinant det(h) is too small ". Could anyone tell me the reasons for 
this? The attachments are my input and output files.Thanks very much for 
all your help!

Best
Yun
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