can't install oppia

When I run start.sh it give me this output and there is a 500 Internal Server Error at localhost:8181

gurungrahul2@gurungrahul2:~/open/oppia$ sudo bash scripts/start.sh
Checking if node.js is installed in /home/gurungrahul2/open/oppia_tools
Generating list of installed node modules...
Generation completed.
Checking whether Google App Engine is installed in /home/gurungrahul2/open/oppia_tools/google_appengine_1.9.67/google_appengine
Checking whether google-cloud-sdk is installed in /home/gurungrahul2/open/oppia_tools/google-cloud-sdk-222.0.0/google-cloud-sdk
Environment setup completed.
Installing third-party JS libraries and zip files.
Checking whether ajv is installed
Checking whether browserstack-local is installed
Checking whether dotenv is installed
Checking whether eslint is installed
Checking whether eslint-plugin-angular is installed
Checking whether eslint-plugin-html is installed
Checking whether gulp is installed
Checking whether gulp-clean-css is installed
Checking whether gulp-concat is installed
Checking whether gulp-sourcemaps is installed
Checking whether gulp-uglify is installed
Checking whether gulp-util is installed
Checking whether htmllint is installed
Checking whether htmllint-cli is installed
Checking whether @mapbox/stylelint-processor-arbitrary-tags is installed
Checking whether postcss-syntax is installed
Checking whether stylelint is installed
Checking whether stylelint-config-standard is installed
Checking whether through2 is installed
Checking whether uglify-js is installed
Checking whether yargs is installed
Checking whether Skulpt is installed in third_party
Checking if pip is installed on the local machine
Checking if pylint is installed in /home/gurungrahul2/open/oppia_tools
Checking if pylint-quotes is installed in /home/gurungrahul2/open/oppia_tools
Checking if webtest is installed in third_party
Checking if isort is installed in third_party
Checking if pycodestyle is installed in third_party
Checking if pyjsparser is installed in third_party
Checking if browsermob-proxy is installed in /home/gurungrahul2/open/oppia_tools
Checking if selenium is installed in /home/gurungrahul2/open/oppia_tools
Checking if PIL is installed in /home/gurungrahul2/open/oppia_tools
Installing pre-push hook for git
Symlink already exists
Building third party libs at third_party/generated/
Starting GAE development server
[10:49:44] Using gulpfile ~/open/oppia/gulpfile.js
INFO     2018-11-25 05:19:44,568 devappserver2.py:105] Skipping SDK update check.
INFO     2018-11-25 05:19:44,657 api_server.py:265] Starting API server at: http://localhost:42933
INFO     2018-11-25 05:19:45,197 dispatcher.py:255] Starting module "default" running at: http://0.0.0.0:8181
INFO     2018-11-25 05:19:45,198 admin_server.py:152] Starting admin server at: http://0.0.0.0:8000

  INFORMATION
  Setting up a local development server at localhost:8181. Opening a
  default browser window pointing to this server.

Done!
INFO     2018-11-25 05:19:50,440 module.py:835] default: "GET /_ah/warmup HTTP/1.1" 200 -
[5166:5166:1125/104950.904140:ERROR:zygote_host_impl_linux.cc(88)] Running as root without --no-sandbox is not supported. See https://crbug.com/638180.
[5176:5176:1125/104951.006391:ERROR:zygote_host_impl_linux.cc(88)] Running as root without --no-sandbox is not supported. See https://crbug.com/638180.
Running Firefox as root in a regular user's session is not supported.  ($HOME is /home/gurungrahul2 which is owned by gurungrahul2.)
/usr/bin/xdg-open: 851: /usr/bin/xdg-open: iceweasel: not found
/usr/bin/xdg-open: 851: /usr/bin/xdg-open: seamonkey: not found
/usr/bin/xdg-open: 851: /usr/bin/xdg-open: mozilla: not found
/usr/bin/xdg-open: 851: /usr/bin/xdg-open: epiphany: not found
/usr/bin/xdg-open: 851: /usr/bin/xdg-open: konqueror: not found
/usr/bin/xdg-open: 851: /usr/bin/xdg-open: chromium: not found
/usr/bin/xdg-open: 851: /usr/bin/xdg-open: chromium-browser: not found
[5206:5206:1125/104951.199782:ERROR:zygote_host_impl_linux.cc(88)] Running as root without --no-sandbox is not supported. See https://crbug.com/638180.
/usr/bin/xdg-open: 851: /usr/bin/xdg-open: www-browser: not found
/usr/bin/xdg-open: 851: /usr/bin/xdg-open: links2: not found
/usr/bin/xdg-open: 851: /usr/bin/xdg-open: elinks: not found
/usr/bin/xdg-open: 851: /usr/bin/xdg-open: links: not found
/usr/bin/xdg-open: 851: /usr/bin/xdg-open: lynx: not found
/usr/bin/xdg-open: 851: /usr/bin/xdg-open: w3m: not found
xdg-open: no method available for opening 'http://localhost:8181/'
INFO     2018-11-25 05:19:59,854 module.py:835] default: "GET / HTTP/1.1" 302 -
INFO     2018-11-25 05:20:00,676 base.py:479] Traceback (most recent call last):
  File "/home/gurungrahul2/open/oppia_tools/google_appengine_1.9.67/google_appengine/lib/webapp2-2.5.2/webapp2.py", line 570, in dispatch
    return method(*args, **kwargs)
  File "/home/gurungrahul2/open/oppia/core/domain/acl_decorators.py", line 59, in test_can_access
    return handler(self, *args, **kwargs)
  File "/home/gurungrahul2/open/oppia/core/controllers/pages.py", line 52, in get
    self.render_template('pages/splash/splash.html')
  File "/home/gurungrahul2/open/oppia/core/controllers/base.py", line 403, in render_template
    self.jinja2_env.get_template(filepath).render(**values))
  File "/home/gurungrahul2/open/oppia_tools/google_appengine_1.9.67/google_appengine/lib/jinja2-2.6/jinja2/environment.py", line 719, in get_template
    return self._load_template(name, self.make_globals(globals))
  File "/home/gurungrahul2/open/oppia_tools/google_appengine_1.9.67/google_appengine/lib/jinja2-2.6/jinja2/environment.py", line 693, in _load_template
    template = self.loader.load(self, name, globals)
  File "/home/gurungrahul2/open/oppia_tools/google_appengine_1.9.67/google_appengine/lib/jinja2-2.6/jinja2/loaders.py", line 115, in load
    source, filename, uptodate = self.get_source(environment, name)
  File "/home/gurungrahul2/open/oppia_tools/google_appengine_1.9.67/google_appengine/lib/jinja2-2.6/jinja2/loaders.py", line 180, in get_source
    raise TemplateNotFound(template)
TemplateNotFound: pages/splash/splash.html

ERROR    2018-11-25 05:20:00,682 base.py:489] Exception raised: pages/splash/splash.html
ERROR    2018-11-25 05:20:00,837 webapp2.py:1552] pages/error/error.html
Traceback (most recent call last):
  File "/home/gurungrahul2/open/oppia_tools/google_appengine_1.9.67/google_appengine/lib/webapp2-2.5.2/webapp2.py", line 1535, in __call__
    rv = self.handle_exception(request, response, e)
  File "/home/gurungrahul2/open/oppia_tools/google_appengine_1.9.67/google_appengine/lib/webapp2-2.5.2/webapp2.py", line 1529, in __call__
    rv = self.router.dispatch(request, response)
  File "/home/gurungrahul2/open/oppia_tools/google_appengine_1.9.67/google_appengine/lib/webapp2-2.5.2/webapp2.py", line 1278, in default_dispatcher
    return route.handler_adapter(request, response)
  File "/home/gurungrahul2/open/oppia_tools/google_appengine_1.9.67/google_appengine/lib/webapp2-2.5.2/webapp2.py", line 1102, in __call__
    return handler.dispatch()
  File "/home/gurungrahul2/open/oppia/core/controllers/base.py", line 249, in dispatch
    super(BaseHandler, self).dispatch()
  File "/home/gurungrahul2/open/oppia_tools/google_appengine_1.9.67/google_appengine/lib/webapp2-2.5.2/webapp2.py", line 572, in dispatch
    return self.handle_exception(e, self.app.debug)
  File "/home/gurungrahul2/open/oppia/core/controllers/base.py", line 507, in handle_exception
    self._render_exception(500, {'error': unicode(exception)})
  File "/home/gurungrahul2/open/oppia/core/controllers/base.py", line 441, in _render_exception
    self.GET_HANDLER_ERROR_RETURN_TYPE, values)
  File "/home/gurungrahul2/open/oppia/core/controllers/base.py", line 421, in _render_exception_json_or_html
    self.render_template('pages/error/error.html')
  File "/home/gurungrahul2/open/oppia/core/controllers/base.py", line 403, in render_template
    self.jinja2_env.get_template(filepath).render(**values))
  File "/home/gurungrahul2/open/oppia_tools/google_appengine_1.9.67/google_appengine/lib/jinja2-2.6/jinja2/environment.py", line 719, in get_template
    return self._load_template(name, self.make_globals(globals))
  File "/home/gurungrahul2/open/oppia_tools/google_appengine_1.9.67/google_appengine/lib/jinja2-2.6/jinja2/environment.py", line 693, in _load_template
    template = self.loader.load(self, name, globals)
  File "/home/gurungrahul2/open/oppia_tools/google_appengine_1.9.67/google_appengine/lib/jinja2-2.6/jinja2/loaders.py", line 115, in load
    source, filename, uptodate = self.get_source(environment, name)
  File "/home/gurungrahul2/open/oppia_tools/google_appengine_1.9.67/google_appengine/lib/jinja2-2.6/jinja2/loaders.py", line 180, in get_source
    raise TemplateNotFound(template)
TemplateNotFound: pages/error/error.html
INFO     2018-11-25 05:20:01,377 module.py:835] default: "GET /splash HTTP/1.1" 500 228
INFO     2018-11-25 05:20:03,481 module.py:835] default: "GET /_ah/warmup HTTP/1.1" 200 -

[seanlip]

Yep, probably. Try deleting your existing directory and re-cloning.

[rahgurung]

It worked.