Werkzeug Internal Server Error

traceback.txt

Traceback (most recent call last):
  File "/Users/steffen/python-react/examples/self_mounting_components/venv/lib/python2.7/site-packages/flask/app.py", line 1836, in __call__
    return self.wsgi_app(environ, start_response)
  File "/Users/steffen/python-react/examples/self_mounting_components/venv/lib/python2.7/site-packages/flask/app.py", line 1820, in wsgi_app
    response = self.make_response(self.handle_exception(e))
  File "/Users/steffen/python-react/examples/self_mounting_components/venv/lib/python2.7/site-packages/flask/app.py", line 1403, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "/Users/steffen/python-react/examples/self_mounting_components/venv/lib/python2.7/site-packages/flask/app.py", line 1817, in wsgi_app
    response = self.full_dispatch_request()
  File "/Users/steffen/python-react/examples/self_mounting_components/venv/lib/python2.7/site-packages/flask/app.py", line 1477, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/Users/steffen/python-react/examples/self_mounting_components/venv/lib/python2.7/site-packages/flask/app.py", line 1381, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/Users/steffen/python-react/examples/self_mounting_components/venv/lib/python2.7/site-packages/flask/app.py", line 1475, in full_dispatch_request
    rv = self.dispatch_request()
  File "/Users/steffen/python-react/examples/self_mounting_components/venv/lib/python2.7/site-packages/flask/app.py", line 1461, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/Users/steffen/python-react/examples/self_mounting_components/example.py", line 45, in index
    rendered = render_component(component, props)
  File "/Users/steffen/python-react/examples/self_mounting_components/venv/lib/python2.7/site-packages/react/render.py", line 17, in render_component
    return renderer.render(path, props, to_static_markup)
  File "/Users/steffen/python-react/examples/self_mounting_components/venv/lib/python2.7/site-packages/react/render_server.py", line 66, in render
    'Message: {}\n\nStack trace: {}'.format(err['message'], err['stack'])
ReactRenderingError: Message: /Users/steffen/python-react/examples/self_mounting_components/node_modules/bootstrap/dist/css/bootstrap.css:7
html {
     ^
Unexpected token {

Stack trace: /Users/steffen/python-react/examples/self_mounting_components/node_modules/bootstrap/dist/css/bootstrap.css:7
html {
     ^
SyntaxError: Unexpected token {
    at exports.runInThisContext (vm.js:73:16)
    at Module._compile (module.js:443:25)
    at Module._extensions..js (module.js:478:10)
    at Object.require.extensions.(anonymous function) [as .js] (/Users/steffen/python-react/node_modules/babel/node_modules/babel-core/lib/api/register/node.js:214:7)
    at Module.load (module.js:355:32)
    at Function.Module._load (module.js:310:12)
    at Module.require (module.js:365:17)
    at require (module.js:384:17)
    at Object.<anonymous> (/Users/steffen/python-react/examples/self_mounting_components/app/CommentBox.jsx:18:1)
    at Module._compile (module.js:460:26)