Error on trjconv

GROMACS version: 2020.1
GROMACS modification: Yes/No

For fixing PBC problem, I used following command:

gmx trjconv -s md.tpr -f md.xtc -o new.gro -pbc mol - center

But I encountered with:

rogram: gmx trjconv, version 2020.1-Ubuntu-2020.1-1
Source file: src/gromacs/utility/futil.cpp (line 442)

File input/output error:
new.gro

For more information and tips for troubleshooting, please check the GROMACS
website at Common Errors — GROMACS webpage https://www.gromacs.org documentation

How to solve that?

The error means either you do not have permission to write files in the working directory or you are out of disk space.

Thank you!