Thank you @Rahad !
Do you mean the minimization step in the AutoDock Vina Extended module? What error does it show?
As for ligand libraries, AutoDock Vina Extended module supports libraries with ligands in formats that can be opened in SAMSON, including .pdb, .mol2, .sdf, .xyz, etc, but not .mol and .pdbqt for now. You do not need to import all the ligands in SAMSON, you just need to provide the path to the folder with a ligand library.