Issue Opening RFNoC Example File: rfnoc_radio_loopback.grc

[abhi345]

Hi all,

I’m trying to open the RFNoC example file titled rfnoc_radio_loopback.grc, available at https://github.com/gnuradio/gnuradio/blob/main/gr-uhd/examples/grc/rfnoc_radio_loopback.grc. However, the file doesn’t open in GNU Radio Companion, and I receive the following error:

>>> Error: Connection between blocks_var_to_msg_0(msgout) and uhd_rfnoc_rx_radio_0(command) could not be made.
	sink key 'command' not in sink block keys
Error: too many values to unpack (expected 4)
>>> Failure

As a beginner, I’m unsure about the underlying cause of the issue. Could it be due to the example using deprecated or unsupported blocks in the latest version of GNU Radio? For context, I use a URSP X300, GNURadio version 3.10.7.0, UHD version UHD 4.2.0.HEAD-0-g46a70d85. 

Any guidance or suggestions on how to resolve this would be greatly appreciated.

Thanks in advance!