plot_date problem

Hello,

I am having a problem with plot_date. I keep getting the error:

File "E:\Python23\Lib\site-packages\matplotlib\axis.py", line 567, in
get_minor_ticks
    numticks = len(self._minorLocator())
TypeError: __call__() takes exactly 3 arguments (1 given)

I'm using Python 2.3.2, Numeric 23.1, and matplotlib 0.54.2. Here's a
short example that exhibits the problem behavior:

···

-----------------------------
from datetime import datetime
from matplotlib.dates import EpochConverter
from matplotlib.matlab import *

times = [1084195314, 1084195375, 1084195436, 1084195497, 1084195557]
vals = [10.2, 11.1, 8.7]
converter = EpochConverter()
ax = subplot(111)
plot_date(times, vals, converter)
show()

-----------------------------

Am I missing something obvious?

Thanks.

Michael Hauser