Template assumes single supervisor and examiner. Most PhD students have two.

Template should have support for multiple supervisors and examiners, ideally by using something like

\supervisor{Ola Nordmann \and Kari Nordmann}

to produce

''' Supervisors: Ola Nordmann and Kari Nordmann '''

A possible quickfix is just to add (s), so it'd be

\supervisor{Ola Nordmann and Kari Nordmann}

to produce

''' Supervisor(s): Ola Nordmann and Kari Nordmann '''