AttributeError: 'gr_hier_block2_sptr' object has no attribute 'set_callback'

I am using ubuntu 12.10 and python version 2.7.3. i run the following command in terminal: matt@matt-Inspiron-1525:~$ 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/p

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using ubuntu 12.10 i am trying to run a python block, namely OP25, in GNU Radio Companion v3.6.3-35-g4435082f. i get the following error: Executing: "/home/matt/op25_grc.py" Imported legacy fsk4 Using Volk machine: ssse3_32 Traceback (most recent call last): File "/home/matt/op25_grc.py", line