Restarting md run

GROMACS version: 2019.2
GROMACS modification: No
I am trying to restart a mdrun which was extended but got interrupted in-between.

The command used to restart the mdrun was
gmx mdrun -s md_100.tpr -cpi state.cpt -e ener.part0002.edr -x traj_comp.part0002.xtc -g md.part0002.log

But still i am getting an error message
Checkpoint file is from part 2, new output files will be suffixed ‘.part0002’.

Program: gmx mdrun, version 2019.2
Source file: src/gromacs/utility/futil.cpp (line 441)

File input/output error:

So can anyone suggest how i can continue this md run with appending the data in existing files.