can't login in v1.2

[Vít Tuček]

I've just installed Invenio 1.2.1 onto Ubuntu 14.04 and I can't login any
users due to a server error. There seems to be one precedent:
https://www.mail-archive.com/project-invenio-general@cern.ch/msg01065.html

invenio.err
Description: Binary data