When I want to use RFNOC block in USRP I am faced with errors.....How can
solve it? can anyone help? thanks in advance

[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/sp/Downloads/rfnoc45.py", line 211, in <module>
>     main()
>   File "/home/sp/Downloads/rfnoc45.py", line 189, in main
>     tb.start()
>   File "/usr/local/lib/python3/dist-packages/gnuradio/gr/top_block.py",
> line 111, in start
>     top_block_start_unlocked(self._impl, max_noutput_items)
>   File "/usr/local/lib/python3/dist-packages/gnuradio/gr/runtime_swig.py",
> line 4832, in top_block_start_unlocked
>     return _runtime_swig.top_block_start_unlocked(r, max_noutput_items)
> RuntimeError: RfnocError: ResolveError: Attempting to overwrite property
> `freq@USER:0' with a new value after it was locked!
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