# 502 Error¶

In some cases, instead of the admin interface, a white page with “502 Error” is displayed

In this case, you need to open the server console, and check the following:

1. The DBMS is running.
sudo service postgresql status


if the service is not running, then you should restart it

sudo service postgresql restart

1. If the launch does not occur, then most likely we have a problem with the database. The problems may vary, but the most likely one is the disk overflow.
df -h


If we see that the disk is 100% filled, then we need to perform automatic or manual disk cleaning.

1. Restart staffcop service
sudo service staffcop restart