Cannot find Block3D

Hi,

I am new user in Palabos. I installed Palabos in python3, when i write this script:
#!/usr/bin/python
from palabos import *
nx, ny, nz = 100, 50, 50
tau = 0.6
lattice = Block3D(nx,ny,nz, D3Q19, BGK(omega=1/tau)),
output: error: Block3D is not defined. Please help me thank you