title: pubsub_v1 TypeError: __init__() got an unexpected keyword argument 'serialized_options'
body: <h3>my version of python is 3.6.9</h3>
  <p>and I tried install many versions of google-cloud-pubsub
  2.1.0
  1.5.0
  1.3.0 .....</p>
  <p>but I still have problem import
  &quot;  &quot;</p>
  <p>the error message is
  &quot;&quot;&quot; <code>from google.cloud import pubsub_v1</code></p>
  <pre><code>---------------------------------------------------------------------------
  TypeError                                 Traceback (most recent call last)
  &lt;ipython-input-30-5ae969a9c485&gt; in &lt;module&gt;
  ----&gt; 1 from google.cloud import pubsub_v1
  
  ~\AppData\Local\Continuum\anaconda3\envs\jb\lib\site-packages\google\cloud\pubsub_v1\__init__.py in &lt;module&gt;
       15 from __future__ import absolute_import
       16 
  ---&gt; 17 from google.cloud.pubsub_v1 import types
       18 from google.cloud.pubsub_v1 import publisher
       19 from google.cloud.pubsub_v1 import subscriber
  
  ~\AppData\Local\Continuum\anaconda3\envs\jb\lib\site-packages\google\cloud\pubsub_v1\types.py in &lt;module&gt;
       17 import sys
       18 
  ---&gt; 19 from google.api import http_pb2
       20 from google.iam.v1 import iam_policy_pb2
       21 from google.iam.v1 import policy_pb2
  
  ~\AppData\Local\Continuum\anaconda3\envs\jb\lib\site-packages\google\api\http_pb2.py in &lt;module&gt;
       33     syntax=&quot;proto3&quot;,
       34     serialized_options=b&quot;\n\016com.google.apiB\tHttpProtoP\001ZAgoogle.golang.org/genproto/googleapis/api/annotations;annotations\370\001\001\242\002\004GAPI&quot;,
  ---&gt; 35     serialized_pb=b'\n\x15google/api/http.proto\x12\ngoogle.api&quot;T\n\x04Http\x12#\n\x05rules\x18\x01 \x03(\x0b\x32\x14.google.api.HttpRule\x12\'\n\x1f\x66ully_decode_reserved_expansion\x18\x02 \x01(\x08&quot;\x81\x02\n\x08HttpRule\x12\x10\n\x08selector\x18\x01 \x01(\t\x12\r\n\x03get\x18\x02 \x01(\tH\x00\x12\r\n\x03put\x18\x03 \x01(\tH\x00\x12\x0e\n\x04post\x18\x04 \x01(\tH\x00\x12\x10\n\x06\x64\x65lete\x18\x05 \x01(\tH\x00\x12\x0f\n\x05patch\x18\x06 \x01(\tH\x00\x12/\n\x06\x63ustom\x18\x08 \x01(\x0b\x32\x1d.google.api.CustomHttpPatternH\x00\x12\x0c\n\x04\x62ody\x18\x07 \x01(\t\x12\x15\n\rresponse_body\x18\x0c \x01(\t\x12\x31\n\x13\x61\x64\x64itional_bindings\x18\x0b \x03(\x0b\x32\x14.google.api.HttpRuleB\t\n\x07pattern&quot;/\n\x11\x43ustomHttpPattern\x12\x0c\n\x04kind\x18\x01 \x01(\t\x12\x0c\n\x04path\x18\x02 \x01(\tBj\n\x0e\x63om.google.apiB\tHttpProtoP\x01ZAgoogle.golang.org/genproto/googleapis/api/annotations;annotations\xf8\x01\x01\xa2\x02\x04GAPIb\x06proto3',
       36 )
       37 
  
  TypeError: __init__() got an unexpected keyword argument 'serialized_options'
  &quot;&quot;&quot; 
  </code></pre>
  <p>I tried change version of protobuf, but i could not solve this problem...
  how to fix this issue???
  Please help me...</p>