gmx_MMPBSA: step3,awk: cmd. line:468: (FILENAME=_pid.pdb FNR=119376) warning: exp: argument 886.554 is out of range

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Dear Dr. Li, I have used gmx_MMPBSA.bsh to calculate the Gibes free energy. But the last step always reported error which is :awk: cmd. line:468: (FILENAME=_pid.pdb FNR=119376) warning: exp: argument 886.554 is out of range. I have checked the .tpr, .xtc, index.ndx file , and did not find any problems. I don't know how to solve this problem, please help me.