Error create new site: No module file_manager

Thanks, I created a password for the account and continued without adding erpnext to the sudo group and this generated this error:

[sudo] password for erpnext: 
erpnext is not in the sudoers file.  This incident will be reported.
Traceback (most recent call last):
  File "/home/erpnext/.local/bin/bench", line 11, in <module>
    load_entry_point('bench', 'console_scripts', 'bench')()
  File "/home/erpnext/.bench/bench/cli.py", line 40, in cli
    bench_command()
  File "/home/erpnext/.local/lib/python2.7/site-packages/click/core.py", line 764, in __call__
    return self.main(*args, **kwargs)
  File "/home/erpnext/.local/lib/python2.7/site-packages/click/core.py", line 717, in main
    rv = self.invoke(ctx)
  File "/home/erpnext/.local/lib/python2.7/site-packages/click/core.py", line 1137, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/home/erpnext/.local/lib/python2.7/site-packages/click/core.py", line 956, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/home/erpnext/.local/lib/python2.7/site-packages/click/core.py", line 555, in invoke
    return callback(*args, **kwargs)
  File "/home/erpnext/.bench/bench/commands/update.py", line 60, in update
    _update(pull, patch, build, bench, auto, restart_supervisor, restart_systemd, requirements, no_backup, force=force, reset=reset)
  File "/home/erpnext/.bench/bench/commands/update.py", line 100, in _update
    restart_supervisor_processes(bench_path=bench_path)
  File "/home/erpnext/.bench/bench/utils.py", line 389, in restart_supervisor_processes
    supervisor_status = subprocess.check_output(['sudo', 'supervisorctl', 'status'], cwd=bench_path)
  File "/usr/lib/python2.7/subprocess.py", line 219, in check_output
    raise CalledProcessError(retcode, cmd, output=output)
subprocess.CalledProcessError: Command '['sudo', 'supervisorctl', 'status']' returned non-zero exit status 1

I then added erpnext to the sudo group, exited, did a su - erpnext again to ensure that the updated groups were loaded and then I got:

bench update --patch
remote: Enumerating objects: 23, done.
remote: Counting objects: 100% (23/23), done.
remote: Compressing objects: 100% (7/7), done.
remote: Total 25 (delta 16), reused 19 (delta 16), pack-reused 2
Unpacking objects: 100% (25/25), done.
From https://github.com/frappe/frappe
   7598c37a2..a60cb001f  develop         -> upstream/develop
   dc2cc5c17..306ca0f44  staging         -> upstream/staging
   8c0fead00..306ca0f44  staging-fixes   -> upstream/staging-fixes
 * [new tag]             v11.0.3-beta.35 -> v11.0.3-beta.35
Backing up sites...
Patching sites...
Migrating erpnext.example.org
Updating DocTypes for frappe        : [========================================]
Updating DocTypes for erpnext       : [========================================]
Syncing help database...
INFO:bench.utils:sudo supervisorctl restart frappe-bench-workers: frappe-bench-web:
frappe-bench-web:frappe-bench-node-socketio: stopped
frappe-bench-web:frappe-bench-frappe-web: stopped
frappe-bench-workers:frappe-bench-frappe-schedule: ERROR (no such file)
frappe-bench-workers:frappe-bench-frappe-default-worker-0: ERROR (no such file)
frappe-bench-workers:frappe-bench-frappe-long-worker-0: ERROR (no such file)
frappe-bench-workers:frappe-bench-frappe-short-worker-0: ERROR (no such file)
frappe-bench-web:frappe-bench-frappe-web: started
frappe-bench-web:frappe-bench-node-socketio: started
________________________________________________________________________________
Bench: Deployment tool for Frappe and ERPNext (https://erpnext.org).
Open source depends on your contributions, so please contribute bug reports, patches, fixes or cash and be a part of the community
()

And I have:

tail /var/log/supervisor/supervisord.log 
2018-12-10 12:08:33,210 INFO spawnerr: can't find command 'None'
2018-12-10 12:08:33,210 INFO gave up: frappe-bench-frappe-short-worker-0 entered FATAL state, too many start retries too quickly
2018-12-10 13:07:11,741 INFO waiting for frappe-bench-frappe-web to stop
2018-12-10 13:07:11,743 INFO waiting for frappe-bench-node-socketio to stop
2018-12-10 13:07:11,758 INFO stopped: frappe-bench-node-socketio (terminated by SIGTERM)
2018-12-10 13:07:12,264 INFO stopped: frappe-bench-frappe-web (exit status 0)
2018-12-10 13:07:13,284 INFO spawned: 'frappe-bench-frappe-web' with pid 4792
2018-12-10 13:07:13,304 INFO spawned: 'frappe-bench-node-socketio' with pid 4793
2018-12-10 13:07:14,308 INFO success: frappe-bench-frappe-web entered RUNNING state, process has stayed up for > than 1 seconds (startsecs)
2018-12-10 13:07:14,308 INFO success: frappe-bench-node-socketio entered RUNNING state, process has stayed up for > than 1 seconds (startsecs)

So this appear to have solved some, but not all of the problems I reported in another thread