PDB error when uploaded

I am a new person in protein-protein docking. I have a problem when I upload pdb file.
The server said Error in PDB file.
“Issue when parsing the PDB file at line 7228 .
Your PDB contains an elemental ion ZN without specified charge” I do not know how to solve it
Thank you

Hi there - this is a classical error, which has been answered many times already :slight_smile:
Note that this forum is searchable. E.g.: Zn2+ issues help needed :)

The information about how to define properly ions is also available at: