Getting type error when running dev_appserver.py

I wanted to deploy my repository for google cloud platform, so it successfully cloned the same using cloud wrapper, but when running dev_appserver.py it gave an error like, below is the error:

Welcome to Cloud Shell! Type "help" to get started.
natu_neeraj@ai-finance-162601:~$ AIDIR=~/src/ai-fiance-162601/apiai-finance-2017-03-30-23-43
natu_neeraj@ai-finance-162601:~$ git clone https://github.com/Neeraj-Natu/NLP_Finance.git $AIDIR
Cloning into '/home/natu_neeraj/src/ai-fiance-162601/apiai-finance-2017-03-30-23-43'...
remote: Counting objects: 847, done.
remote: Compressing objects: 100% (742/742), done.
remote: Total 847 (delta 95), reused 819 (delta 85), pack-reused 0
Receiving objects: 100% (847/847), 2.04 MiB | 0 bytes/s, done.
Resolving deltas: 100% (95/95), done.
natu_neeraj@ai-finance-162601:~$ cd $AIDIR
natu_neeraj@ai-finance-162601:~/src/ai-fiance-162601/apiai-finance-2017-03-  30-23-43$ git checkout master
Already on 'master'
Your branch is up-to-date with 'origin/master'.
natu_neeraj@ai-finance-162601:~/src/ai-fiance-162601/apiai-finance-2017-03-    30-23-43$ dev_appserver.py $PWD
Traceback (most recent call last):
File "/google/google-cloud-sdk/platform/google_appengine/dev_appserver.py", line 101, in <module>
_run_file(__file__, globals())
File "/google/google-cloud-sdk/platform/google_appengine/dev_appserver.py", line 97, in _run_file
execfile(_PATHS.script_file(script_name), globals_)
File "/google/google-cloud-sdk/platform/google_appengine/google/appengine/tools/devappserver2/devappserver2    .py", line 1041, in <module>
main()
File "/google/google-cloud-sdk/platform/google_appengine/google/appengine/tools/devappserver2/devappserver2.py", line 1037, in main
dev_server.stop()
File "/google/google-cloud-sdk/platform/google_appengine/google/appengine/tools/devappserver2/devappserver2.py", line 845, in stop
metrics.GetMetricsLogger().Stop()
File "/google/google-cloud-sdk/platform/google_appengine/google/appengine/tools/devappserver2/metrics.py",     line 117, in Stop
total_run_time = int((Now() - self._start_time).total_seconds())
TypeError: unsupported operand type(s) for -: 'datetime.datetime' and 'NoneType'

      

        
        
        
      

    

natu_neeraj @ ai-finance-162601: ~ / src / ai-fiance-162601 / apiai-finance-2017-03- 30-23-43 $

Can anyone help me what I am doing wrong?

I am using python 2.7.13