pyasn1 import error in Google Compute Engine #229

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/local/lib/python2.7/dist-packages/firebase_admin/__init__.py", line 22, in <module>
    from firebase_admin import credentials
  File "/usr/local/lib/python2.7/dist-packages/firebase_admin/credentials.py", line 23, in <module>
    from google.oauth2 import service_account
  File "/usr/local/lib/python2.7/dist-packages/google/oauth2/service_account.py", line 77, in <module>
    from google.auth import _service_account_info
  File "/usr/local/lib/python2.7/dist-packages/google/auth/_service_account_info.py", line 22, in <module>
    from google.auth import crypt
  File "/usr/local/lib/python2.7/dist-packages/google/auth/crypt/__init__.py", line 39, in <module>
    from google.auth.crypt import rsa
  File "/usr/local/lib/python2.7/dist-packages/google/auth/crypt/rsa.py", line 17, in <module>
    from google.auth.crypt import _python_rsa
  File "/usr/local/lib/python2.7/dist-packages/google/auth/crypt/_python_rsa.py", line 29, in <module>
    from pyasn1_modules.rfc2459 import Certificate
  File "/usr/local/lib/python2.7/dist-packages/pyasn1_modules/rfc2459.py", line 20, in <module>
    from pyasn1.type import opentype
ImportError: cannot import name opentype