Receive Error: ERROR_CODE_LATE_COMMAND

[MobiZaman]

Hi, I have two USRP devices, N2920 and B210. I test loopback mode on N2920 with USRP Echotimer and things seem to be running smoothly. I can see the frequency and time plot correctly. But when I run the same thing for USRP B210, I can see the frequency but not the time plot (it shows a straight line at zero). I think that my connections on B210 are correct between the usrp_echotimer_sync_pulse.grc example is working fine on it and I can see the time plot. I think the issue is with the settings of frequency and sample rate because some particular frequencies were giving me the same errors on N2920 as well.

I have attached the related grc files. They have been run in GNU Radio 3.8. Can you please help me with this issue?
grc_files.zip

[hfarooq98]

Hi, Sorry I can't help you with your issue but can you solve mine? Plz

I am unable to install Qwt library. I installed using different guides available online but Qwt Widgets didn't show up in Qt Creator so I was unable to complete build. Kindly help!