
Traceback (most recent call last):


 "/usr/local/lib/python3.6/dist-packages/jupyterhub/app.py", line 2515, in start

await self.proxy.start()


 "/usr/local/lib/python3.6/dist-packages/jupyterhub/proxy.py", line 656, in start

cmd, env=env, start_new_session=True, shell=shell


 "/usr/lib/python3.6/subprocess.py", line 729, in __init__

restore_signals, start_new_session)


 "/usr/lib/python3.6/subprocess.py", line 1364, in _execute_child

raise child_exception_type(errno_num, err_msg, err_filename)


NotFoundError: [Errno 2] No such file or directory: 'configurable-http-proxy': 'configurable-http-proxy'

Traceback (most recent call last):


 "/usr/local/lib/python3.7/dist-packages/easyprocess/__init__.py", line 169, in start

cmd, stdout=stdout, stderr=stderr, cwd=self.cwd, env=self.env,


 "/usr/lib/python3.7/subprocess.py", line 800, in __init__

restore_signals, start_new_session)


 "/usr/lib/python3.7/subprocess.py", line 1551, in _execute_child

raise child_exception_type(errno_num, err_msg, err_filename)

NotFoundError: [Errno 2] No such file or directory: 'Xvfb': 'Xvfb'
