Here is your error:
[08/Sep/2011:14:34:33][1177.3074541248][-main-] Error: Ns_PgOpenDb(postgres): Could not connect to localhost:5432:openacs: 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"?
Is your database server running?