Error with lookup service nominatim.openstreetmap.org

https://nominatim.openstreetmap.org/ See below - any help?

I'm trying to lookup like this: https://nominatim.openstreetmap.org/search?format=json&city=calgary&state=alberta&country=canada

string(19) "pgsql://@/nominatim"
object(DB_Error)#2 (8) {
 ["error_message_prefix"]=>
 string(0) ""
 ["mode"]=>
 int(1)
 ["level"]=>
 int(1024)
 ["code"]=>
 int(-24)
 ["message"]=>
 string(24) "DB Error: connect failed"
 ["userinfo"]=>
 string(272) " [nativecode=pg_connect(): Unable to connect to PostgreSQL server: could not connect to server: No such file or directory
   Is the server running locally and accepting
   connections on Unix domain socket "/var/run/postgresql/.s.PGSQL.5432"?] ** pgsql://@/nominatim"

...

DB Error: connect failed