AN ERROR OCCURED!

URI:
http://www.newindigo.eu/login

Class/Method:
Newindigo::Users->login()

Error message:
Failed to call hook hook_make_calendar with Arguments : DBI connect('dbname=newindigo;host=localhost;port=5432','seas3-newindigo',...) failed: could not connect to server: Connection refused Is the server running on host "localhost" (127.0.0.1) and accepting TCP/IP connections on port 5432? at /usr/local/share/perl/5.14.2/Ima/DBI.pm line 328.

Additional messages: