Traceback (most recent call last):


 "tox21_graphcnn.py", line 15, in <module>

import deepchem as dc


 "/home/anaconda2/envs/deepchem/lib/python3.5/site-packages/deepchem/__init__.py", line 9, in <module>

import deepchem.data


 "/home/anaconda2/envs/deepchem/lib/python3.5/site-packages/deepchem/data/__init__.py", line 18, in <module>

from deepchem.data.data_loader import DataLoader


 "/home/anaconda2/envs/deepchem/lib/python3.5/site-packages/deepchem/data/data_loader.py", line 19, in <module>

from deepchem.feat import UserDefinedFeaturizer


 "/home/anaconda2/envs/deepchem/lib/python3.5/site-packages/deepchem/feat/__init__.py", line 15, in <module>

from deepchem.feat.graph_features import ConvMolFeaturizer


 "/home/anaconda2/envs/deepchem/lib/python3.5/site-packages/deepchem/feat/graph_features.py", line 5, in <module>

from rdkit import Chem


 "/home//anaconda2/envs/deepchem/lib/python3.5/site-packages/rdkit/__init__.py", line 2, in <module>

from .rdBase import rdkitVersion as __version__
ImportError: /lib64/libstdc++.so.6: version `GLIBCXX_3.4.21' not found (required by /home/anaconda2/envs/deepchem/lib/python3.5/site-packages/rdkit/rdBase.so)

Traceback (most recent call last):


 "/anaconda3/lib/python3.6/site-packages/spyder/app/mainwindow.py", line 3126, in main

mainwindow = run_spyder(app, options, args)


 "/anaconda3/lib/python3.6/site-packages/spyder/app/mainwindow.py", line 3023, in run_spyder

main.setup()


 "/anaconda3/lib/python3.6/site-packages/spyder/app/mainwindow.py", line 825, in setup

from spyder.plugins.console import Console


 "/anaconda3/lib/python3.6/site-packages/spyder/plugins/console.py", line 35, in <module>

from spyder.widgets.internalshell import InternalShell


 "/anaconda3/lib/python3.6/site-packages/spyder/widgets/internalshell.py", line 27, in <module>

from spyder.interpreter import Interpreter


 "/anaconda3/lib/python3.6/site-packages/spyder/interpreter.py", line 14, in <module>

import ctypes


 "/anaconda3/lib/python3.6/ctypes/__init__.py", line 7, in <module>

from _ctypes import Union, Structure, Array
ImportError: dlopen(/anaconda3/lib/python3.6/lib-dynload/_ctypes.cpython-36m-darwin.so, 2): Symbol not found: __PyUnicode_AsWideCharString
