ValueError at /admin/judge/problem

[Pablourquia]

When i click in "Problems" button makes a error.
This error say:
ValueError at /admin/jutge/problem
Database returned an invalid datetime value. Are time zone definitions for your database installed?
The error in in line: window.jQuey = django.jQuery

[n6v26r]

You need to go through the guide and run the timezone thingy.