*.deb files

When I run the final command in the build instructions for linux cnc:
linuxcnc.org/docs/stable/html/code/build...-configure-arguments
dpkg-buildpackage -b -uc

I see two *.deb files and a .ddeb file:

linuxcnc-uspace_2.10.0~pre0_amd64.deb  linuxcnc-uspace-dbgsym_2.10.0~pre0_amd64.ddeb  linuxcnc-uspace-dev_2.10.0~pre0_amd64.deb

I'm probably missing something obvious, but what is the difference between these three files?

Thanks so much,
Alan

Same problem

make[1]: Entering directory '/home/armada/linuxcnc-dev'
# The G-code quick reference html docs are built as
# `docs/html/en_US.UTF-8/gcode.html`. We install them
# into `/usr/share/doc/linuxcnc-uspace/` in each
# linuxcnc-doc-en_US.UTF-8 package, then rename them there (except
# for the English one) to include the language in the filename,
# so they don't collide when we install all the doc debs.
#
# Rename the "main" doc directories from
# `usr/share/doc/linuxcnc-uspace` to `usr/share/doc/linuxcnc`,
# because that's where the `.desktop` files look for the docs.
dh_installdocs --doc-main-package=linuxcnc-uspace --package=linuxcnc-doc-de
install -d debian/linuxcnc-doc-de/usr/share/doc/linuxcnc-doc-de
dh_installdocs: error: Cannot find (any matches for) "usr/share/doc/linuxcnc/LinuxCNC_Developer_de.pdf" (tried in ., debian/tmp)

make[1]: *** [debian/rules:108: override_dh_installdocs-indep] Error 255
make[1]: Leaving directory '/home/armada/linuxcnc-dev'
make: *** [debian/rules:38: binary] Error 2
dpkg-buildpackage: error: debian/rules binary subprocess returned exit status 2

I've installed many times and no problems. But now it not work

How correctly write this command?

I am also not near computer, I'll check this tomorrow only.
All the same, I wanted to know how to correctly write this command
I tried to install by proven way myself.
Then I did everything according to the guide with same kernal Debian 11.5 (5.10.0-18-rt)
gnipsel.com/linuxcnc/debian-11-emc.html
And got the same error
Why could this happen?