Forum: GNU Radio usrp_basic_tx: can't open tx interface give me some advice please thanks

Hi,all
i came up with a nasty problem,confusing me for a long time .
I want to run two similar（or identical） scrips on one computer,say it
tunnel.py, the first one without any question ,when i run another ,it
came up with this error messages :




root@ubuntu:# ./sig_ana_201110.py -f 2400M
>>> gr_fir_fff: using SSE
usrp_open_interface:usb_claim_interface: failed interface 1
could not claim interface 1: Device or resource busy
usrp_basic_tx: can't open tx interface
Traceback (most recent call last):
  File "./sig_ana_201110.py", line 402, in <module>
    main()
  File "./sig_ana_201110.py", line 380, in main
    options)
  File "./sig_ana_201110.py", line 80, in __init__
    self.txpath = usrp_transmit_path.usrp_transmit_path(mod_class,
options)
  File
"/home/zdl/gnuradio-3.2.2/20120922/node/us/usrp_transmit_path.py", line
68, in __init__
    self._setup_usrp_sink(options)
  File
"/home/zdl/gnuradio-3.2.2/20120922/node/us/usrp_transmit_path.py", line
77, in _setup_usrp_sink
    self.u = usrp_options.create_usrp_sink(options)
  File "/home/zdl/gnuradio-3.2.2/20120922/node/us/usrp_options.py", line
119, in create_usrp_sink
    gain=options.tx_gain,
  File "/home/zdl/gnuradio-3.2.2/20120922/node/us/generic_usrp.py", line
199, in __init__
    _generic_usrp_base.__init__(self, **kwargs)
  File "/home/zdl/gnuradio-3.2.2/20120922/node/us/generic_usrp.py", line
63, in __init__
    except: raise Exception, 'Failed to automatically setup a usrp
device.'
Exception: Failed to automatically setup a usrp device.



i try to find answer on the net ,but can't find any solution,Thank you
very much for all your help.
eric