I am using using ubuntu 12.10 i am trying to run OP25 (python version 2.7.3), in GNU Radio Companion v3.6.3-35-g4435082f and i get an error. So I run the traceback command in terminal:

~$ python -m trace --count -C . op25_grc.py

Here is the output with an error:

Imported legacy fsk4
Using Volk machine: ssse3_32
Traceback (most recent call last):
File "/usr/lib/python2.7/runpy.py", line 162, in run_module_as_main
"_main__", fname, loader, pkg_name)
File "/usr/lib/python2.7/runpy.py", line 72, in run_code
exec code in run_globals
File "/usr/lib/python2.7/trace.py", line 819, in
main()
File "/usr/lib/python2.7/trace.py", line 807, in main
t.runctx(code, globs, globs)
File "/usr/lib/python2.7/trace.py", line 513, in runctx
exec cmd in globals, locals
File "op25_grc.py", line 493, in
tb = op25_grc()
File "op25_grc.py", line 231, in __init_
self.wxgui_fftsink2_0_0.set_callback(wxgui_fftsink2_0_0_callback)
File "/usr/local/lib/python2.7/dist-packages/gnuradio/gr/hier_block2.py", line 54, in getattr
return getattr(self._hb, name)
AttributeError: 'gr_hier_block2_sptr' object has no attribute 'set_callback'

I really really want to get OP25 running but have not been able to figure out what is the solution to this error (AttributeError: 'gr_hier_block2_sptr' object has no attribute 'set_callback')
. it'll take me ages to figure out how to debug in python. some threads have said its because gnuradio is an older version but in my case it is not. i am wondering if the question is too amateur or something because nobody is lending assistance.

Any help will be so very much appreciated. Thanks.