How do I rectify this error?

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1

GROMACS version: 2021
GROMACS modification: Yes/No
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ERROR 1 [file md_pull.mdp]:
When the maximum distance from a pull group reference atom to other atoms
in the group is larger than 0.5 times half the box size a centrally
placed atom should be chosen as pbcatom. Pull group 1 is larger than that
and does not have a specific atom selected as reference atom.

ERROR 2 [file md_pull.mdp]:
When the maximum distance from a pull group reference atom to other atoms
in the group is larger than 0.5 times half the box size a centrally
placed atom should be chosen as pbcatom. Pull group 2 is larger than that
and does not have a specific atom selected as reference atom.

2

This post should help: Defining central atom in steered molecular dynamics