LaTeX-Compile errors with german Users Guide

[Stephan Witt]

Hi,

I cannot compile the german Users Guide w/o errors anymore with master.

Two errors are for broken references like this:

Xindy error:  Cross-reference-target ("Nomenklatur}}}|hyperpage") does not exist!

and tons of errors like that:

Undefined control sequence.
    \item  plus3\p
                     minus7\p \abovedisplayshortskip \z plus3\p \belowdispla...
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.

and

Extra }, or forgotten \endgroup.
    \item Abkürzungen}
                          }, \hyperpage{73}
I've deleted a group-closing symbol because it seems to be
spurious, as in `$x}$'. But perhaps the } is legitimate and
you forgot something else, as in `\hbox{$x}'. In such cases
the way to recover is to insert both the forgotten and the
deleted material, e.g., by typing `I$}’.

or 

Illegal unit of measure (pt inserted).
  ...4.5}\selectfont  \abovedisplayskip 12\p pl
                                                  us3\p minus7\p \abovedispl…

The log file has a size of 1.1 MByte - too big to attach.

Is it a problem on my system only? I’m using TeX Live 2020 on Mac.

Stephan