ImportError: cannot import name weight

[oroojlooy]

Hi,
I am getting this error when I call python train.py,

Traceback (most recent call last):
File "train.py", line 10, in
from lib.nn_model.model import get_nn_model
File "/home/afo214/tensorflow/vrp/seqTOseq/debug_seq2seq/lib/nn_model/model.py", line 4, in
from seq2seq.models import SimpleSeq2seq
File "build/bdist.linux-x86_64/egg/seq2seq/init.py", line 1, in
File "build/bdist.linux-x86_64/egg/seq2seq/cells.py", line 1, in
ImportError: cannot import name weight

Any idea?