Prewikka Statistics Internal Error

I get an "Internal Error" when accessing Prewikka Statistics, this is
running as a cgi on httpd:

Traceback (most recent call last):
  File "/usr/local/lib/python2.5/site-packages/prewikka/Core.py", line 335,
in process
    getattr(view_object, view["handler"])()
  File "/usr/local/lib/python2.5/site-packages/prewikka/views/stats.py",
line 503, in render
    self._renderClassificationsTrend(criteria)
  File "/usr/local/lib/python2.5/site-packages/prewikka/views/stats.py",
line 492, in _renderClassificationsTrend
    "alert.classification.text", criteria, limit = 10,
zoom_type="classifications_trend")
  File "/usr/local/lib/python2.5/site-packages/prewikka/views/stats.py",
line 447, in _addTimelineChart
    timeline.render(title)
  File "/usr/local/lib/python2.5/site-packages/prewikka/Chart.py", line 311,
in render
    x_labels = self._labels, series_legend=True, series_colors=colors)
  File "/usr/local/lib/python2.5/site-packages/prewikka/cairoplot.py", line
2003, in dot_line_plot
    plot.render()
  File "/usr/local/lib/python2.5/site-packages/prewikka/cairoplot.py", line
451, in render
    self.calc_all_extents()
  File "/usr/local/lib/python2.5/site-packages/prewikka/cairoplot.py", line
416, in calc_all_extents
    self.calc_extents(HORZ)
  File "/usr/local/lib/python2.5/site-packages/prewikka/cairoplot.py", line
393, in calc_extents
    self.max_value[direction] = max(self.context.text_extents(item)[2] for
item in self.labels[direction])
  File "/usr/local/lib/python2.5/site-packages/prewikka/cairoplot.py", line
393, in <genexpr>
    self.max_value[direction] = max(self.context.text_extents(item)[2] for
item in self.labels[direction])
MemoryError

Prewikka and Prelude were compiled from source, version 1.0.0.
I'm using OpenBSD 4.7 with cairo installed from packages version:
 cairo-1.8.8p0       vector graphics library
 py-cairo-1.8.8      cairo bindings for Python


-- 
Colin
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