Error on using DDC RFNoC block.

[NIDHIPANDA]

Hello,

I am having USRP X300 device with following tool versions:

Vivado 2021.1 - AR76780n,
GNU radio version - v3.11.0.0git-820-g2adbd4ea
UHD version - UHD_4.7.0.0-84-gbdada1ed

I am trying to use the default example present in the GNU radio example folder "rfnoc_radio_ddc.grc". I am able to down convert the input signal with the desired frequency however on using frequency shift feature it hives following error:

[WARNING] [0/Radio#0] Attempting to set tick rate to 0. Skipping.
[ERROR] [RFNOC::GRAPH::DETAIL] 0/DDC#0: RfnocError: ResolveError: Attempting to overwrite property freq@USER:0' with a new value after it was locked! Traceback (most recent call last): File "/home/quasar/gnuradio/gr-uhd/examples/grc/rfnoc_radio_ddc.py", line 330, in <module> main() File "/home/quasar/gnuradio/gr-uhd/examples/grc/rfnoc_radio_ddc.py", line 309, in main tb.start() File "/usr/local/lib/python3.8/dist-packages/gnuradio/gr/top_block.py", line 116, in start top_block_start_unlocked(self._impl, max_noutput_items) RuntimeError: RfnocError: ResolveError: Attempting to overwrite property freq@USER:0' with a new value after it was locked!

I have used the default .bit file which includes DDC blocks. Please suggest how to resolve this.

Regards,
Nidhi