LinuxCNC 2.8.1 configuration doesn't run after upgrading from 2.7.15

Hello

I have a 2.7.15 configuration with Mesa and concerning a Mikron milling retrofit. It works wellI
I try an update to 2.8.1, but my application does not start ?
A simple step / dir configuration test starts well
My setup has a lot of personal components. They installed correctly, except for a userspace component:
halcompile ignore the singleton statement?

Thank you for your advice

In your debug Information
Seems you should update Python or some in this area to

Thank you for your answer
I didn't do any development in Python.
the error points to a pin in my file
mikron_postguy.hal
I have a trivial configuration
with mikron.xml and mikron_postgui.hal

Most probably something wrong with constructing the 'pyvcp.b3ar-led' in the xml, dimensions might be off or have a character instead of a number.

2.8 has a bug when it comes to userspace singleton comps.
I had to remove the 'singleton yes' line from the userspace comp file. Then add .0 after each reference to pins etc. in my hal files.

thank you,
I think my Pyvcp syntax is good, it works fine on 2.7.15.

under 2.8.1, if I modify my config options a little, the error points to other pins