The bug is originally in g-brief.cls, when using newer versions of the file marvosym.sty - the latter defines a symbol \Telefon which is re-defined in g-brief.
A simple bugfix is to comment out the first definition of \Telefon in g-brief as follows:
200 201 %%\def\Telefon#1{\def\telefon{#1}} \def\telefon{} <-- here 202 \def\Telefax#1{\def\telefax{#1}} \def\telefax{} 203 \def\Telex#1{\def\telex{#1}} \def\telex{} 204 \def\EMail#1{\def\email{#1}} \def\email{} 205 \def\HTTP#1{\def\http{#1}} \def\http{} 206
The bug is originally in g-brief.cls, when using newer versions of the file marvosym.sty - the latter defines a symbol \Telefon which is re-defined in g-brief.
A simple bugfix is to comment out the first definition of \Telefon in g-brief as follows:
200 Telefon# 1{\def\ telefon{ #1}} \def\telefon{} <-- here 1{\def\ telefax{ #1}} \def\telefax{} 1{\def\ telex{# 1}} \def\telex{} 1{\def\ email{# 1}} \def\email{} 1{\def\ http{#1} } \def\http{}
201 %%\def\
202 \def\Telefax#
203 \def\Telex#
204 \def\EMail#
205 \def\HTTP#
206