The first thing to try is - quit GRC - rm ~/.cache/grc_gnuradio/cache.json - start GRC - reselect the signal type in the signal source block (or delete and re-add the block)
If that does not work, you might want to try a more recent version of 3.9, installed from the PPA ppa:gnuradio/gnuradio-maint-3.9. On Sat, Apr 17, 2021 at 2:17 AM David Martini <[email protected]> wrote: > Hi all, > > I upgrade the system to ubuntu 20.04 starting from iso. > Then I install GNURADIO 3.9.0.0 following the instruction in the wiki. > GNU radio is correctly installed because I'm able to run > successfully top_block.py but I have problems building the flowgraf. > In attached picture of the error that I get : waveforms generator don't > show frequency (even do in block editor is correctly assigned). > Of course I'm not able to generate any topblock. > I try to re-install gnuradio but get same error. > On internet I found some indication that the problem can be in grc.conf > file global_block_patch but not working on my cases. > > Thank you for help. > > David > >
