Hi all,

I tried the same configuration but I got the following error:INFO\] \[UHD\] 
linux; GNU C++ version 9.3.0; Boost_107100; UHD_4.0.0.0-50-ge520e3ff

`[INFO] [X300] X300 initialization sequence...`

`[INFO] [X300] Maximum frame size: 8000 bytes.`

`[INFO] [GPS] Found an internal GPSDO: LC_XO, Firmware Rev 0.929a`

`[INFO] [X300] Radio 1x clock: 200 MHz`

`Traceback (most recent call last):`

`  File "/home/wisp/rfnoc_ws/rfnoc-test/examples/rfnoc_gain.py", line 354, in 
<module>`

`    main()`

`  File "/home/wisp/rfnoc_ws/rfnoc-test/examples/rfnoc_gain.py", line 330, in 
main`

`    tb = top_block_cls()`

`  File "/home/wisp/rfnoc_ws/rfnoc-test/examples/rfnoc_gain.py", line 93, in 
__init__`

`    self.ettus_rfnoc_rx_streamer_1 = ettus.rfnoc_rx_streamer(`

`  File "/usr/local/lib/python3/dist-packages/ettus/ettus_swig.py", line 1423, 
in make`

`    return _ettus_swig.rfnoc_rx_streamer_make(graph, num_chans, stream_args, 
vlen, issue_stream_cmd_on_start)`

`RuntimeError: ValueError: [rx_stream] Must provide a otw_format!`

Do you guys have any idea?

Thanks
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