Diagnose urh crass on startup

[jcoles56]

I installed on Linux Mint 20.1 using the "Generic Installation with pip (recommended)" instructions.
When I try to start the app, I get code errors:

$ urh
Traceback (most recent call last):
File "/usr/local/bin/urh", line 8, in
sys.exit(main())
File "/usr/local/lib/python3.8/dist-packages/urh/main.py", line 84, in main
import urh.cythonext.signal_functions
File "src/urh/cythonext/signal_functions.pyx", line 1, in init urh.cythonext.signal_functions
ValueError: numpy.ndarray size changed, may indicate binary incompatibility. Expected 88 from C header, got 80 from PyObject

Does anyone know what the problem might be?

[jcoles56]

The fix turned out to be simple.
pip uninstall numpy
pip install numpy

My topic title should say "crash" not "crass", by the way.

[geo207]

jcoles56,

When you reinstalled numpy with pip, did it reinstall all of the other programs that were uninstalled when numpy was uninstalled?
When I type pip uninstall numpy, I get the following caution message:

$ pip uninstall numpy
Found existing installation: numpy 1.17.4
Uninstalling numpy-1.17.4:
Would remove:
/usr/bin/f2py
/usr/bin/f2py3
/usr/bin/f2py3.8
/usr/lib/python3/dist-packages/numpy
/usr/lib/python3/dist-packages/numpy-1.17.4.egg-info
Proceed (Y/n)?

I would like to know if your program removed all of these packages and then reinstalled everything back when you reinstalled numpy. Please also see issue #897:
#897

[jcoles56]

I think it did reinstall those files. I just checked in Synaptic and those files are part of the python3-numpy package, version 1.17.4-5ubuntu3, which is currently installed.

I haven't done much with the URH since installing it. It looks like there's a big learning curve ahead of me.