Problem gnuradio.uhd attribute

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