when I choose DAG item, it goes endless loding

[gabrielwithappy]

when I choose DAG item, it goes endless loding

1. environment : ubuntu 18.04
2. airflow docker compse
3. problem
   after docker compose up, I can login to airflow webserver.
   When I click any example DAG of Grid tab, "..." show up forever.

I followed cleaning-up the environment of the airflow website.
However it happens again.

Is there anyclue where I can check?

[gabrielwithappy]

It happens hwen it is Grid section.
I will check what grid section is