Water molecule cannot be settled

Dear gromacs users,
I want to simulate Protein-Ligand.In nvt step, I have an error:

step 5: Water molecule starting at atom 4637 can not be settled. Check for bad contacts and/or reduce the timestep if appropriate.

How can I resolve it? I would be happy to know your opinions and get your advice. I’m thankful if you guide me on how I can solve this problem.