Hi, everyone, 

I am doing some calculations on electron-phonon coupling. I encountered the 
following problem. 
ph.x program stops at the "electron-phonon interaction  ..." and the only error 
information I got is :


forrtl: severe (71): integer divide by zero
Image              PC                Routine            Line        Source
ph.x               0000000000CFFC31  Unknown               Unknown  Unknown
ph.x               0000000000CFE387  Unknown               Unknown  Unknown
ph.x               0000000000CA0754  Unknown               Unknown  Unknown
ph.x               0000000000CA0566  Unknown               Unknown  Unknown
ph.x               0000000000C370FF  Unknown               Unknown  Unknown
ph.x               0000000000C3EC1F  Unknown               Unknown  Unknown
libpthread.so.0    00002B67CFC1D100  Unknown               Unknown  Unknown
ph.x               00000000004304B2  elphsum_                  709  elphon.f90
ph.x               000000000040BE7B  do_phonon_                119  
do_phonon.f90
ph.x               000000000040595F  MAIN__                     78  phonon.f90
ph.x               00000000004058CE  Unknown               Unknown  Unknown
libc.so.6          00002B67D014DB15  Unknown               Unknown  Unknown
ph.x               00000000004057D9  Unknown               Unknown  Unknown
forrtl: severe (71): integer divide by zero
Image              PC                Routine            Line        Source
ph.x               0000000000CFFC31  Unknown               Unknown  Unknown
ph.x               0000000000CFE387  Unknown               Unknown  Unknown
ph.x               0000000000CA0754  Unknown               Unknown  Unknown
ph.x               0000000000CA0566  Unknown               Unknown  Unknown
ph.x               0000000000C370FF  Unknown               Unknown  Unknown
ph.x               0000000000C3EC1F  Unknown               Unknown  Unknown
libpthread.so.0    00002B9F748A4100  Unknown               Unknown  Unknown
ph.x               00000000004304B2  elphsum_                  709  elphon.f90
ph.x               000000000040BE7B  do_phonon_                119  
do_phonon.f90
ph.x               000000000040595F  MAIN__                     78  phonon.f90
ph.x               00000000004058CE  Unknown               Unknown  Unknown
libc.so.6          00002B9F74DD4B15  Unknown               Unknown  Unknown
ph.x               00000000004057D9  Unknown               Unknown  Unknown
forrtl: severe (71): integer divide by zero
Image              PC                Routine            Line        Source
ph.x               0000000000CFFC31  Unknown               Unknown  Unknown
ph.x               0000000000CFE387  Unknown               Unknown  Unknown


Can anyone help me?


Sincerely, 
Xiaoyu Liu
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