Problem with Python OOT module

Hi,
I am trying to use an OOT module written by someone. The module is writen in
Python and crashes on following line:
...
self.avg = filter.single_pole_iir_filter_ff_make(1.0, self.fac_size)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: module 'gnuradio.filter' has no attribute
'single_pole_iir_filter_ff_make'. Did you mean: 'single_pole_iir_filter_ff'?

As I guess the module is hierarchical one and tries to build a flowgraph using
a single pole IIR filter block from gr-filter but fails.
Is something wrong here?

--
Wojciech