i am using uhd model in gnuradio,usrp_sink and usrp_source to do a loopback 
sysrem
and i connect the usrp tx and rx withRF feeder line,when i exe the grc ,i got 
the output 
UHD Error:
the receiver packet handler caught an exception.
runtimeerror:usb rx6 transfer status:LIBUSB_TRANSFER_ERROR
UHD source block got error code 0xf
i wants to konw how tp solve this problem


I am using https://github.com/anastas/gr-cdma/tree/master/apps cdma_txrx.grc
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