Your message is confusing. Do you mean that your created the graph under 
gnuradio-3.9 but are trying to execute it under Gnuradio 3.8? 

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> On Mar 15, 2021, at 4:47 AM, COURANT Frederique - Contractor 
> <[email protected]> wrote:
> 
> 
> Hello,
>  
> I try to test the flow graph that I have created with gnuradio-companion 3.9 
> but when I run my script I have this error “module gnuradio.uhd has no 
> attribute rfnoc_tx_radio.
> I work with UHD 4.0, gnuradio 3.8 .
>  
> Someone have solutions for this error please ?
>  
> Best regards
>  

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