[Discuss-gnuradio] usrp: failed to find usrp [0]

Hi
By mistake i have pulled out the connection of USRP while the
benchmark_rx.py program was running.
Now i get an Error : 
usrp: failed to find usrp[0]
Traceback (most recent call last):
  File "benchmark_tx.py", line 137, in <module>
    main()
  File "benchmark_tx.py", line 98, in main
    tb = my_top_block(mods[options.modulation], options)
  File "benchmark_tx.py", line 42, in __init__
    self.txpath = transmit_path(modulator, options)
  File "/Users/udaya/gnuradio-examples/python/digital/transmit_path.py",
line 64, in __init__
    self._setup_usrp_sink(options)
  File "/Users/udaya/gnuradio-examples/python/digital/transmit_path.py",
line 111, in _setup_usrp_sink
    self.u = usrp_options.create_usrp_sink(options)
  File "/Users/udaya/gnuradio-examples/python/digital/usrp_options.py", line
99, in create_usrp_sink
    fusb_nblocks=options.fusb_nblocks,
  File "/Users/udaya/gnuradio-examples/python/digital/generic_usrp.py", line
153, in __init__
    except: self._setup_usrp_source()
  File "/Users/udaya/gnuradio-examples/python/digital/generic_usrp.py", line
176, in _setup_usrp_source
    fusb_nblocks=self._fusb_nblocks)
  File "/usr/local/lib/python2.5/site-packages/gnuradio/usrp/usrp_swig.py",
line 2469, in sink_c
    return _usrp_swig.sink_c(*args, **kwargs)
RuntimeError: can't open usrp
Exception exceptions.AttributeError: "'gr_hier_block2_sptr' object has no
attribute '_type'" in <bound method generic_usrp_sink_c.__del__ of
<generic_usrp.generic_usrp_sink_c object at 0x2a32cd0>> ignored

Please help...Thanks
Udaya


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