Error in loading parameters for tleap

error:

Error!
For atom (.R<UNK 1>.A<O39 39>) could not find vdW (or other) parameters for type (O.3)

my build.leap file:

source leaprc.protein.ff14SB
source leaprc.water.tip3p
source leaprc.gaff
source leaprc.lipid14
loadoff …/parameters/Doxorubicin_pos.off
loadamberparams frcmod.ionsjc_tip3p
drug = loadpdb dox_pos_center.pdb
bilayer = loadpdb DMPC_72_relax.pdb
mol = combine { drug bilayer }
set mol box {48.158000946044922 47.37200164794922 77.938003540039064}
saveamberparm mol DMPC_dox_pos.prmtop DMPC_dox_pos.inpcrd
quit