Update Error npm install error

I just ran bench update

bench.utils.CommandFailedError: npm install
frappe@erpnext:~/frappe-bench$ bench back-up-all-sites
Usage: bench [OPTIONS] COMMAND [ARGS]...

Error: No such command "back-up-all-sites".
frappe@erpnext:~/frappe-bench$ cd ..
frappe@erpnext:~$ cd bench-repo
frappe@erpnext:~/bench-repo$ git fetch
frappe@erpnext:~/bench-repo$ git reset --hard origin/master
HEAD is now at d43bae4 Merge pull request #588 from codingCoffee/minor_fix
frappe@erpnext:~/bench-repo$ cd ..
frappe@erpnext:~$ cd frappe-bench
frappe@erpnext:~/frappe-bench$ bench update
INFO:bench.utils:updating bench
INFO:bench.utils:git pull
Already up-to-date.
INFO:bench.utils:./env/bin/pip install Pillow
Requirement already satisfied: Pillow in ./env/lib/python2.7/site-packages
INFO:bench.app:pulling frappe
INFO:bench.utils:git pull  upstream master
From https://github.com/frappe/frappe
 * branch            master     -> FETCH_HEAD
Already up-to-date.
INFO:bench.utils:find . -name "*.pyc" -delete
INFO:bench.app:pulling erpnext
INFO:bench.utils:git pull  upstream master
From https://github.com/frappe/erpnext
 * branch            master     -> FETCH_HEAD
Already up-to-date.
INFO:bench.utils:find . -name "*.pyc" -delete
INFO:bench.app:pulling erpnext_demo
INFO:bench.utils:git pull  upstream master
From https://github.com/frappe/erpnext_demo
 * branch            master     -> FETCH_HEAD
Already up-to-date.
INFO:bench.utils:find . -name "*.pyc" -delete
Updating Python libraries...
INFO:bench.utils:./env/bin/pip install --upgrade pip
Requirement already up-to-date: pip in ./env/lib/python2.7/site-packages
INFO:bench.utils:./env/bin/pip install -q -r /home/frappe/bench-repo/requirements.txt
INFO:bench.utils:./env/bin/pip install -q -r ./apps/erpnext/requirements.txt
INFO:bench.utils:./env/bin/pip install -q -r ./apps/erpnext_demo/requirements.txt
INFO:bench.utils:./env/bin/pip install -q -r ./apps/frappe/requirements.txt
Updating node packages...
INFO:bench.utils:npm install

> chromedriver@2.35.0 install /home/frappe/frappe-bench/node_modules/chromedriver
> node install.js

Only Linux 64 bits supported.
npm WARN frappe@ No description
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.1.3 (node_modules/fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.1.3: wanted {"os":"d
arwin","arch":"any"} (current: {"os":"linux","arch":"ia32"})

npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! chromedriver@2.35.0 install: `node install.js`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the chromedriver@2.35.0 install script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     /home/frappe/.npm/_logs/2018-03-04T22_03_34_803Z-debug.log
Traceback (most recent call last):
  File "/usr/local/bin/bench", line 9, in <module>
    load_entry_point('bench', 'console_scripts', 'bench')()
  File "/home/frappe/bench-repo/bench/cli.py", line 40, in cli
    bench_command()
  File "/usr/local/lib/python2.7/dist-packages/click/core.py", line 716, in __call__
    return self.main(*args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/click/core.py", line 696, in main
    rv = self.invoke(ctx)
  File "/usr/local/lib/python2.7/dist-packages/click/core.py", line 1060, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/usr/local/lib/python2.7/dist-packages/click/core.py", line 889, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/usr/local/lib/python2.7/dist-packages/click/core.py", line 534, in invoke
    return callback(*args, **kwargs)
  File "/home/frappe/bench-repo/bench/commands/update.py", line 58, in update
    _update(pull, patch, build, bench, auto, restart_supervisor, requirements, no_backup, force=force,
 reset=reset)
  File "/home/frappe/bench-repo/bench/commands/update.py", line 75, in _update
    update_node_packages(bench_path=bench_path)
  File "/home/frappe/bench-repo/bench/utils.py", line 443, in update_node_packages
    update_npm_packages(bench_path)
  File "/home/frappe/bench-repo/bench/utils.py", line 490, in update_npm_packages
    exec_cmd('npm install', cwd=bench_path)
  File "/home/frappe/bench-repo/bench/utils.py", line 145, in exec_cmd
    raise CommandFailedError(cmd)
bench.utils.CommandFailedError: npm install

Follow the steps in link.