Airflow Homepage is not able to render due to TypeError: must be str, not NoneType

[harshitkgupta]

Apache Airflow version:

Kubernetes version (if you are using kubernetes) (use kubectl version):

Environment:

• Cloud provider or hardware configuration:
• OS (e.g. from /etc/os-release): Mav
• Kernel (e.g. uname -a):
• Install tools: Docker image
• Others:

What happened:
Traceback (most recent call last):
File "/home/airflow/.local/lib/python3.6/site-packages/flask/app.py", line 2447, in wsgi_app
response = self.full_dispatch_request()
File "/home/airflow/.local/lib/python3.6/site-packages/flask/app.py", line 1952, in full_dispatch_request
rv = self.handle_user_exception(e)
File "/home/airflow/.local/lib/python3.6/site-packages/flask/app.py", line 1821, in handle_user_exception
reraise(exc_type, exc_value, tb)
File "/home/airflow/.local/lib/python3.6/site-packages/flask/_compat.py", line 39, in reraise
raise value
File "/home/airflow/.local/lib/python3.6/site-packages/flask/app.py", line 1950, in full_dispatch_request
rv = self.dispatch_request()
File "/home/airflow/.local/lib/python3.6/site-packages/flask/app.py", line 1936, in dispatch_request
return self.view_functionsrule.endpoint
File "/home/airflow/.local/lib/python3.6/site-packages/flask_appbuilder/security/decorators.py", line 109, in wraps
return f(self, *args, **kwargs)
File "/home/airflow/.local/lib/python3.6/site-packages/airflow/www/views.py", line 359, in index
status_count_paused=status_count_paused)
File "/home/airflow/.local/lib/python3.6/site-packages/airflow/www/views.py", line 185, in render_template
**kwargs
File "/home/airflow/.local/lib/python3.6/site-packages/flask_appbuilder/baseviews.py", line 281, in render_template
template, **dict(list(kwargs.items()) + list(self.extra_args.items()))
File "/home/airflow/.local/lib/python3.6/site-packages/flask/templating.py", line 140, in render_template
ctx.app,
File "/home/airflow/.local/lib/python3.6/site-packages/flask/templating.py", line 120, in _render
rv = template.render(context)
File "/home/airflow/.local/lib/python3.6/site-packages/jinja2/environment.py", line 1090, in render
self.environment.handle_exception()
File "/home/airflow/.local/lib/python3.6/site-packages/jinja2/environment.py", line 832, in handle_exception
reraise(*rewrite_traceback_stack(source=source))
File "/home/airflow/.local/lib/python3.6/site-packages/jinja2/_compat.py", line 28, in reraise
raise value.with_traceback(tb)
File "/home/airflow/.local/lib/python3.6/site-packages/airflow/www/templates/airflow/dags.html", line 20, in top-level template code
{% extends base_template %}
File "/home/airflow/.local/lib/python3.6/site-packages/airflow/www/templates/airflow/master.html", line 20, in top-level template code
{% extends 'appbuilder/baselayout.html' %}
File "/home/airflow/.local/lib/python3.6/site-packages/flask_appbuilder/templates/appbuilder/baselayout.html", line 2, in top-level template code
{% import 'appbuilder/baselib.html' as baselib %}
File "/home/airflow/.local/lib/python3.6/site-packages/flask_appbuilder/templates/appbuilder/init.html", line 46, in top-level template code
{% block body %}
File "/home/airflow/.local/lib/python3.6/site-packages/flask_appbuilder/templates/appbuilder/baselayout.html", line 19, in block "body"
{% block content %}
File "/home/airflow/.local/lib/python3.6/site-packages/airflow/www/templates/airflow/dags.html", line 111, in block "content"
<a href="{{ url_for('Airflow.'+ dag.default_view, dag_id=dag.dag_id) }}"
TypeError: must be str, not NoneType

What you expected to happen:

How to reproduce it:

Anything else we need to know:

[boring-cyborg]

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[mik-laj]

What version of Airflow do you have?

[harshitkgupta]

@mik-laj version- 2.0.0.dev0
i am running following command
docker run -it -p 8080:8080 --env-file local.env -e LOAD_EX=n -v /Users/harshit.gupta/IdeaProjects/datalake/airflow/dags:/opt/airflow/dags apache/airflow:master-python3.6 webserver