Error when moving on mana or sea food with Creation II caster.

[lfgr]

Got the following python error:

#!
Traceback (most recent call last):

  File "CvSpellInterface", line 31, in canCast

  File "<string>", line 0, in ?

  File "CvSpellInterface", line 4553, in reqFertility

NameError: global name 'onus' is not defined
ERR: Python function canCast failed, module CvSpellInterface

With python popups enabled, it's only possible to move the mage from the tile using the "Move To" button.

Playing with rev 1811 (Change: Lightbringers can earn free XP) plus wilderness.