Remove failure with new session. about goblin HOT 9 CLOSED

$ pip install git+https://github.com/davebshow/goblin.git

$ pip install git+https://github.com/davebshow/goblin.git

  pip install git+https://github.com/davebshow/goblin.git

[root@Master graph]# pip install git+https://github.com/davebshow/goblin.git
Collecting git+https://github.com/davebshow/goblin.git
  Cloning https://github.com/davebshow/goblin.git to /tmp/pip-rvk8v5as-build
  Error [Errno 2] No such file or directory: 'git' while executing command git clone -q https://github.com/davebshow/goblin.git /tmp/pip-rvk8v5as-build
Cannot find command 'git'

Traceback (most recent call last):
  File "/usr/local/python36/lib/python3.6/site-packages/flask/app.py", line 1982, in wsgi_app
    response = self.full_dispatch_request()
  File "/usr/local/python36/lib/python3.6/site-packages/flask/app.py", line 1614, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/usr/local/python36/lib/python3.6/site-packages/flask/app.py", line 1517, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/usr/local/python36/lib/python3.6/site-packages/flask/_compat.py", line 33, in reraise
    raise value
  File "/usr/local/python36/lib/python3.6/site-packages/flask/app.py", line 1612, in full_dispatch_request
    rv = self.dispatch_request()
  File "/usr/local/python36/lib/python3.6/site-packages/flask/app.py", line 1598, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "stan.py", line 109, in del_vertex
    loop.run_until_complete(delvertex(id_number))
  File "/usr/local/python36/lib/python3.6/asyncio/base_events.py", line 466, in run_until_complete
    return future.result()
  File "stan.py", line 80, in delvertex
    await session.remove_vertex(vertex)
  File "/usr/local/python36/lib/python3.6/site-packages/goblin/session.py", line 281, in remove_vertex
    vertex = self.current.pop(hashable_id)
  File "/usr/local/python36/lib/python3.6/weakref.py", line 240, in pop
    o = self.data.pop(key)()
KeyError: 3338352