<div style="line-height:1.7;color:#000000;font-size:14px;font-family:Arial"><div><span style="font-size: 18px;">Hi, everyone, </span></div><div><br></div><div><span style="font-size: 18px;">I am doing some calculations on electron-phonon coupling. I encountered the following problem. </span></div><div><span style="font-size: 18px;">ph.x program stops at the "electron-phonon interaction  ..." and the only error information I got is :</span></div><div><br></div><div><div>forrtl: severe (71): integer divide by zero</div><div>Image              PC                Routine            Line        Source</div><div>ph.x               0000000000CFFC31  Unknown               Unknown  Unknown</div><div>ph.x               0000000000CFE387  Unknown               Unknown  Unknown</div><div>ph.x               0000000000CA0754  Unknown               Unknown  Unknown</div><div>ph.x               0000000000CA0566  Unknown               Unknown  Unknown</div><div>ph.x               0000000000C370FF  Unknown               Unknown  Unknown</div><div>ph.x               0000000000C3EC1F  Unknown               Unknown  Unknown</div><div>libpthread.so.0    00002B67CFC1D100  Unknown               Unknown  Unknown</div><div>ph.x               00000000004304B2  elphsum_                  709  elphon.f90</div><div>ph.x               000000000040BE7B  do_phonon_                119  do_phonon.f90</div><div>ph.x               000000000040595F  MAIN__                     78  phonon.f90</div><div>ph.x               00000000004058CE  Unknown               Unknown  Unknown</div><div>libc.so.6          00002B67D014DB15  Unknown               Unknown  Unknown</div><div>ph.x               00000000004057D9  Unknown               Unknown  Unknown</div><div>forrtl: severe (71): integer divide by zero</div><div>Image              PC                Routine            Line        Source</div><div>ph.x               0000000000CFFC31  Unknown               Unknown  Unknown</div><div>ph.x               0000000000CFE387  Unknown               Unknown  Unknown</div><div>ph.x               0000000000CA0754  Unknown               Unknown  Unknown</div><div>ph.x               0000000000CA0566  Unknown               Unknown  Unknown</div><div>ph.x               0000000000C370FF  Unknown               Unknown  Unknown</div><div>ph.x               0000000000C3EC1F  Unknown               Unknown  Unknown</div><div>libpthread.so.0    00002B9F748A4100  Unknown               Unknown  Unknown</div><div>ph.x               00000000004304B2  elphsum_                  709  elphon.f90</div><div>ph.x               000000000040BE7B  do_phonon_                119  do_phonon.f90</div><div>ph.x               000000000040595F  MAIN__                     78  phonon.f90</div><div>ph.x               00000000004058CE  Unknown               Unknown  Unknown</div><div>libc.so.6          00002B9F74DD4B15  Unknown               Unknown  Unknown</div><div>ph.x               00000000004057D9  Unknown               Unknown  Unknown</div><div>forrtl: severe (71): integer divide by zero</div><div>Image              PC                Routine            Line        Source</div><div>ph.x               0000000000CFFC31  Unknown               Unknown  Unknown</div><div>ph.x               0000000000CFE387  Unknown               Unknown  Unknown</div></div><div><br></div><div><span style="font-size: 18px;">Can anyone help me?</span></div><div><br></div><div><span style="font-size: 18px;">Sincerely, </span></div><div><span style="font-size: 18px;">Xiaoyu Liu</span></div></div>