jrd281 opened a new issue #12489: URL: https://github.com/apache/airflow/issues/12489
**Apache Airflow version**: 2.0.0b2 **Kubernetes version (if you are using kubernetes)** (use `kubectl version`): N/A **Environment**: - **Cloud provider or hardware configuration**: Ubuntu 20.04 Guest/Windows Server 2012 R2 Host - **OS** (e.g. from /etc/os-release): Ubuntu 20.04.1 LTS - **Kernel** (e.g. `uname -a`): Linux 5.4.0-1031-azure #32-Ubuntu SMPx86_64 GNU/Linux - **Install tools**: Pip 20.3b1, Ansible Template - https://github.com/jrd281/ansible-role-airflow/tree/airflowdbg-1 - **Others**: Python 3.8 **What happened**: I was looking at the taskinstance list and then I clicked the edit icon. After clicking, an error page was displayed. <!-- (please include exact error messages if you can) --> **What you expected to happen**: <!-- What do you think went wrong? --> **How to reproduce it**: 1. Visit your installation's home page 2. Click the success bucket under the `Recent Tasks` heading <img width="261" alt="AirflowDebug#1" src="https://user-images.githubusercontent.com/848305/99696511-c5462b00-2a5c-11eb-92f1-088347b657a2.png";> 3. Click the `Edit` button for one of your tasks <img width="285" alt="AirflowDebug#2" src="https://user-images.githubusercontent.com/848305/99696788-1524f200-2a5d-11eb-9127-5a308a8ba14c.png";> 4. Watch the system throw an error. <img width="355" alt="AirflowDebug#3" src="https://user-images.githubusercontent.com/848305/99697050-57e6ca00-2a5d-11eb-93f1-1e88aaf59c63.png";> **Anything else we need to know**: <details><summary>UI Error Page</summary> Something bad has happened. Please consider letting us know by creating a bug report using GitHub. Python version: 3.8.5 Airflow version: 2.0.0b2 Node: REDACTED ------------------------------------------------------------------------------- Traceback (most recent call last): File "/var/lib/airflow/venv/lib/python3.8/site-packages/flask/app.py", line 2447, in wsgi_app response = self.full_dispatch_request() File "/var/lib/airflow/venv/lib/python3.8/site-packages/flask/app.py", line 1952, in full_dispatch_request rv = self.handle_user_exception(e) File "/var/lib/airflow/venv/lib/python3.8/site-packages/flask/app.py", line 1821, in handle_user_exception reraise(exc_type, exc_value, tb) File "/var/lib/airflow/venv/lib/python3.8/site-packages/flask/_compat.py", line 39, in reraise raise value File "/var/lib/airflow/venv/lib/python3.8/site-packages/flask/app.py", line 1950, in full_dispatch_request rv = self.dispatch_request() File "/var/lib/airflow/venv/lib/python3.8/site-packages/flask/app.py", line 1936, in dispatch_request return self.view_functions[rule.endpoint](**req.view_args) File "/var/lib/airflow/venv/lib/python3.8/site-packages/flask_appbuilder/security/decorators.py", line 109, in wraps return f(self, *args, **kwargs) File "/var/lib/airflow/venv/lib/python3.8/site-packages/flask_appbuilder/views.py", line 606, in edit return self.render_template( File "/var/lib/airflow/venv/lib/python3.8/site-packages/flask_appbuilder/baseviews.py", line 280, in render_template return render_template( File "/var/lib/airflow/venv/lib/python3.8/site-packages/flask/templating.py", line 137, in render_template return _render( File "/var/lib/airflow/venv/lib/python3.8/site-packages/flask/templating.py", line 120, in _render rv = template.render(context) File "/var/lib/airflow/venv/lib/python3.8/site-packages/jinja2/environment.py", line 1090, in render self.environment.handle_exception() File "/var/lib/airflow/venv/lib/python3.8/site-packages/jinja2/environment.py", line 832, in handle_exception reraise(*rewrite_traceback_stack(source=source)) File "/var/lib/airflow/venv/lib/python3.8/site-packages/jinja2/_compat.py", line 28, in reraise raise value.with_traceback(tb) File "/var/lib/airflow/venv/lib/python3.8/site-packages/flask_appbuilder/templates/appbuilder/general/model/edit.html", line 2, in top-level template code {% import 'appbuilder/general/lib.html' as lib %} File "/var/lib/airflow/venv/lib/python3.8/site-packages/flask_appbuilder/templates/appbuilder/base.html", line 1, in top-level template code {% extends base_template %} File "/var/lib/airflow/venv/lib/python3.8/site-packages/airflow/www/templates/airflow/master.html", line 20, in top-level template code {% extends 'appbuilder/baselayout.html' %} File "/var/lib/airflow/venv/lib/python3.8/site-packages/flask_appbuilder/templates/appbuilder/baselayout.html", line 2, in top-level template code {% import 'appbuilder/baselib.html' as baselib %} File "/var/lib/airflow/venv/lib/python3.8/site-packages/flask_appbuilder/templates/appbuilder/init.html", line 46, in top-level template code {% block body %} File "/var/lib/airflow/venv/lib/python3.8/site-packages/flask_appbuilder/templates/appbuilder/baselayout.html", line 19, in block "body" {% block content %} File "/var/lib/airflow/venv/lib/python3.8/site-packages/flask_appbuilder/templates/appbuilder/general/model/edit.html", line 23, in block "content" {% block edit_form %} File "/var/lib/airflow/venv/lib/python3.8/site-packages/flask_appbuilder/templates/appbuilder/general/model/edit.html", line 25, in block "edit_form" {{ widgets.get('edit')(form_action=form_action)|safe }} File "/var/lib/airflow/venv/lib/python3.8/site-packages/flask_appbuilder/widgets.py", line 37, in __call__ return template.render(args) File "/var/lib/airflow/venv/lib/python3.8/site-packages/jinja2/environment.py", line 1090, in render self.environment.handle_exception() File "/var/lib/airflow/venv/lib/python3.8/site-packages/jinja2/environment.py", line 832, in handle_exception reraise(*rewrite_traceback_stack(source=source)) File "/var/lib/airflow/venv/lib/python3.8/site-packages/jinja2/_compat.py", line 28, in reraise raise value.with_traceback(tb) File "/var/lib/airflow/venv/lib/python3.8/site-packages/flask_appbuilder/templates/appbuilder/general/widgets/form.html", line 45, in top-level template code {{ lib.render_field(field, begin_sep_label, end_sep_label, begin_sep_field, end_sep_field) }} File "/var/lib/airflow/venv/lib/python3.8/site-packages/jinja2/runtime.py", line 679, in _invoke rv = self._func(*arguments) File "/var/lib/airflow/venv/lib/python3.8/site-packages/flask_appbuilder/templates/appbuilder/general/lib.html", line 237, in template {{ field(**kwargs)|safe }} File "/var/lib/airflow/venv/lib/python3.8/site-packages/wtforms/fields/core.py", line 160, in __call__ return self.meta.render_field(self, kwargs) File "/var/lib/airflow/venv/lib/python3.8/site-packages/wtforms/meta.py", line 56, in render_field return field.widget(field, **render_kw) File "/var/lib/airflow/venv/lib/python3.8/site-packages/flask_appbuilder/fieldwidgets.py", line 176, in __call__ return super(Select2ManyWidget, self).__call__(field, **kwargs) File "/var/lib/airflow/venv/lib/python3.8/site-packages/wtforms/widgets/core.py", line 300, in __call__ for val, label, selected in field.iter_choices(): File "/var/lib/airflow/venv/lib/python3.8/site-packages/flask_appbuilder/fields.py", line 209, in iter_choices yield (pk, self.get_label(obj), obj in self.data) TypeError: argument of type 'DagRun' is not iterable </details> **How often does this problem occur?:** Every time I click the `Edit` icon ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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