Building error at module DroneCAN: unknown markup sequence: @) [solved]

Hi,
I’m working on Linux Mint 21.2 (Based on Ubuntu Jammy).
Branch is current master (8a478abce99cb3409d45b812ff36e7263e8257a6).
The sub-modules are up to date (git status is Ok - nothing to commit).

I’m running into an error at building sitl-plane (and also real FCs e.g. MATEKH745) on sub-module DroneCAN and have no idea how to solve that.
An older branch of mine (ca. 03.2023) with older sub-modules is built without such errors.

Build_Problem_DroneCAN.txt (21.2 KB)

Could anybody see what happened and how to fix it?

I tried to build and after success I rebased my code on Plane-4.4 and all is working fine.
Maybe the submodules of master are currently under construction?