PDB file elemental ion CA without specified charge

I input pdb file to calculate binding affinity energy.

but HADDOCK output says
“Error message
First pdb file contains an elemental ion CA without specified charge”

I want to modify ion CA’s charge 0 → +2

I tried and look for methods in Pymol. But, I cannot find it.
Is anyone to teach me to modify charge in Pymol?

Thank you





PS: And the HADDOCK score is not equal to binding affinity…