[Koha] My Koha is down .. Software error?

[Jared Camins-Esakov]

David,

No, we are not using apache server and Koha was working on Friday .. it has
> suddenly stopped (broke over the weekend).  No system changes were made.
>

The error you describe is the result of the MySQL user being incorrect in
the koha-conf.xml file. In this case, you have it configured to log into
Koha using the MySQL user www-data. You will want to make sure the user
name and password at the end of koha-conf.xml are correct, and that you
have the KOHA_CONF variable set correctly for Plack (I presume you are
using Plack, if you are not using Apache?)

Regards,
Jared

-- 
Jared Camins-Esakov
Bibliographer, C & P Bibliography Services, LLC
(phone) +1 (917) 727-3445
(e-mail) jcamins at cpbibliography.com
(web) http://www.cpbibliography.com/