[Discuss-gnuradio] error in importing libraries (beginner question)

[Choolo]

hello, i'm fairly new GNU Radio and it is confusing me a bit. I have recently
succeeded (i think) in installing GNU radio on my ubuntu 7.10 computer. But
then I quickly encountered an error on the first line of my code. Forgive me
if this question is too simple, i am really a novice in this whole thing.
This is the error message:

>>> from gnuradio import gr
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python2.5/site-packages/gnuradio/gr/__init__.py",
line 43, in <module>
    from gnuradio_swig_python import *
  File
"/usr/local/lib/python2.5/site-packages/gnuradio/gr/gnuradio_swig_python.py",
line 24, in <module>
    from gnuradio_swig_py_general import *
  File
"/usr/local/lib/python2.5/site-packages/gnuradio/gr/gnuradio_swig_py_general.py",
line 6, in <module>
    import _gnuradio_swig_py_general
ImportError:
/usr/local/lib/python2.5/site-packages/gnuradio/gr/_gnuradio_swig_py_general.so:
undefined symbol: _Z24gr_make_ofdm_bpsk_mapperjjj

i tried reinstalling the gnuradio and usrp packages but this error still
comes up. Any ideas?
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