Topol.top file not generating

GROMACS version: gmx pdb2gmx, version 2020-rc1-MODIFIED
GROMACS modification: Yes

While trying to generate the force field for LYSOZYME (AKI1) I am receiving the following error message:

Program: gmx pdb2gmx, version 2020-rc1-MODIFIED
Source file: src\gromacs\utility\futil.cpp (line 442)

File input/output error:
topol.top

How to fix this?

Could you describe how you prepared the files and share the exact commands you used?