USRP UHD Source problem

[Mike Markowski]

I'm running gnuradio companion 3.8.1.0 (Python 3.8.6) on Ubuntu 2020.10. After a few weeks away from gnuradio, today I get errors with the USRP UHD Source, and previously working flowgraphs no longer build. (Previously built flowgraph python files still run fine.) The attached flowgraph doesn't get much simpler, but building yields:

Generating: '/home/mm/sdr/fm/uhdTest.py'



[... on and on ...]

, uhd.ALL_MBOARDS)\n% else:\n# No synchronization enforced.\n% endif\n')
>>> Failure
Traceback (most recent call last):
  File "memory:0x7f3082ab36d0", line 136, in render_body

    return compat_builtins.__dict__[key]
KeyError: 'len_tag_name'

[... still more...]

Is anyone else seeing this error?

Thanks,
Mike

Generate Error: (NameError("'len_tag_name' is not defined"), 'uhd.usrp_source(\n ",".join((${dev_addr}, ${dev_args})),\n uhd.stream_args(\n cpu_format="${type}",\n File "/usr/lib/python3/dist-packages/mako/runtime.py", line 106, in __getitem__

uhdTest.grc
Description: application/gnuradio-grc