ephraimbuddy commented on issue #19785:
URL: https://github.com/apache/airflow/issues/19785#issuecomment-1174387487
> Is there a stack trace in the webserver logs? (It looks like the API call
failed with a 500)
Yes. Here's the stacktrace:
```log
[2022-07-04 21:18:55+0000 929ms] {app.py:1456} ERROR - Exception on
/object/grid_data [GET]
Traceback (most recent call last):
File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 2077, in
wsgi_app
response = self.full_dispatch_request()
File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 1525, in
full_dispatch_request
rv = self.handle_user_exception(e)
File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 1523, in
full_dispatch_request
rv = self.dispatch_request()
File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 1509, in
dispatch_request
return
self.ensure_sync(self.view_functions[rule.endpoint])(**req.view_args)
File "/opt/airflow/airflow/www/auth.py", line 46, in decorated
return func(*args, **kwargs)
File "/opt/airflow/airflow/www/views.py", line 3628, in grid_data
'groups': dag_to_grid(dag, dag_runs, session),
File "/opt/airflow/airflow/www/views.py", line 409, in dag_to_grid
return task_group_to_grid(dag.task_group, dag_runs, grouped_tis)
File "/opt/airflow/airflow/www/views.py", line 361, in task_group_to_grid
task_group_to_grid(child, dag_runs, grouped_tis) for child in
task_group.topological_sort()
File "/opt/airflow/airflow/utils/task_group.py", line 450, in
topological_sort
raise AirflowDagCycleException(f"A cyclic dependency occurred in dag:
{self.dag_id}")
airflow.exceptions.AirflowDagCycleException: A cyclic dependency occurred in
dag: label_bug_without_chain
```
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