The error I'm getting is:

Parse error on line 14 in file "..\..\Ligands\4_uff_E=171.63_uff_E=131.73.pdbqt": ATOM syntax incorrect: "Si" is not a valid AutoDock type. Note that AutoDock atom types are case-sensitive.

I've tried using Autodock by adding Si atom parameters as mentioned-

"atom_par Si 4.30 0.402 12.175 -0.00110 0.0 0.0 0 -1 -1 4 # Non H-bonding"

in AD4_parameters.dat, AD4.1_bound.dat file and mentioned parameter_file AD4_parameters.dat on top of my gpf and dpf files and it worked. But I want to work on (PyRx) Autodock Vina because I have multiple ligands to work upon.