I installed Postgres.app, and when I open it, the menu bar icon says "Running on Port 5432". But when I click on the "Open psql" menu option, I see the following message:

```
/Applications/Postgres.app/Contents/MacOS/bin/psql ; exit;
psql: could not connect to server: No such file or directory
Is the server running locally and accepting
connections on Unix domain socket "/tmp/.s.PGSQL.5432"?
logout

[Process completed]

```

Any ideas what might be up?