Multi user login fails - Githubissues

I am running jupyterhub as root user.
I have 2 other users,
alawrence (is a sudo user)
puthiry (is not a sudo user)
I am able to login with alawrence. But when I try to login with puthiry, I am getting the following error
[I 2018-05-14 06:37:09.876 JupyterHub log:122] 302 GET /user/puthiry/ → /hub/user/puthiry/ (@::ffff:10.0.2.2) 18.90ms
sudo: unable to execute /home/alawrence/dev/jupyter/lab/bin/sudospawner: Permission denied
[E 2018-05-14 06:37:10.492 JupyterHub spawner:83] Failed to get JSON result from mediator: ''
[E 2018-05-14 06:37:10.520 JupyterHub user:427] Unhandled error starting puthiry's server: substring not found
[E 2018-05-14 06:37:10.692 JupyterHub web:1621] Uncaught exception GET /hub/user/puthiry/ (::ffff:10.0.2.2)
    HTTPServerRequest(protocol='http', host='localhost:8000', method='GET', uri='/hub/user/puthiry/', version='HTTP/1.1', remote_ip='::ffff:10.0.2.2')
    Traceback (most recent call last):
      File "/home/alawrence/dev/jupyter/lab/lib/python3.6/site-packages/tornado/web.py", line 1543, in _execute
        result = yield result
      File "/home/alawrence/dev/jupyter/lab/lib/python3.6/site-packages/jupyterhub/handlers/base.py", line 747, in get
        yield self.spawn_single_user(current_user)
      File "/home/alawrence/dev/jupyter/lab/lib/python3.6/site-packages/jupyterhub/handlers/base.py", line 475, in spawn_single_user
        yield gen.with_timeout(timedelta(seconds=self.slow_spawn_timeout), finish_spawn_future)
      File "/home/alawrence/dev/jupyter/lab/lib/python3.6/site-packages/jupyterhub/handlers/base.py", line 445, in finish_user_spawn
        yield spawn_future
      File "/home/alawrence/dev/jupyter/lab/lib/python3.6/site-packages/jupyterhub/user.py", line 439, in spawn
        raise e
      File "/home/alawrence/dev/jupyter/lab/lib/python3.6/site-packages/jupyterhub/user.py", line 378, in spawn
        ip_port = yield gen.with_timeout(timedelta(seconds=spawner.start_timeout), f)
      File "/home/alawrence/dev/jupyter/lab/lib/python3.6/site-packages/sudospawner/spawner.py", line 92, in start
        reply = yield self.do(action='spawn', args=self.get_args(), env=self.get_env())
      File "/home/alawrence/dev/jupyter/lab/lib/python3.6/site-packages/sudospawner/spawner.py", line 80, in do
        data_str = data_str[data_str.index('{'):data_str.rindex('}')+1]
    ValueError: substring not found

[E 2018-05-14 06:37:10.860 JupyterHub log:114] {
      "X-Forwarded-Host": "localhost:8000",
      "X-Forwarded-Proto": "http",
      "X-Forwarded-Port": "8000",
      "X-Forwarded-For": "::ffff:10.0.2.2",
      "Upgrade-Insecure-Requests": "1",
      "Connection": "close",
      "Dnt": "1",
      "Cookie": "jupyter-hub-token=\"2|1:0|10:1526293512|17:jupyter-hub-token|44:MmIxYjM2YWM4MTJkNDg0NWFmM2NmNzM2MmExZGM4ODM=|e8aeee3929320302dc2d38569c3914a0360b03ac1f224e56188047e14c474979\"",
      "Referer": "http://localhost:8000/hub/home",
      "Accept-Encoding": "gzip, deflate",
      "Accept-Language": "en-US,en;q=0.5",
      "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8",
      "User-Agent": "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:59.0) Gecko/20100101 Firefox/59.0",
      "Host": "localhost:8000"
    }
[E 2018-05-14 06:37:10.867 JupyterHub log:122] 500 GET /hub/user/puthiry/ (puthiry@::ffff:10.0.2.2) 896.26ms
jupyterhub / sudospawner

Multi user login fails #50
