Ursula Hermann schrieb am 12.09.2023 um 11:19:
>
> Dear List,
>
> I have done an little example with a \blackrule:
>
> \setuppapersize[A8,landscape]
>
> \setuplayout[leftmargin=2.5cm,
>
> leftmargindistance=0.2cm,
>
> backspace=2.9cm,
>
> width=4cm]
>
> \starttext
>
> \margintext{\blackrule[color=black, height=0.05ex, 
> width=1cm]\\Me}\blackrule[color=black, height=0.05ex, width=4cm]
>
> \startformula
>
> a^n + b^n = c^n.
>
> \stopformula
>
> \stoptext
>
> My Question is , where to put margintext, with \dontleavethemode, with 
> blackrule, because if I put it after \starttext:
>
> \margintext{\blackrule\\{Me}}\dontleavehmode\blackrule
>
> Before :
>
> \margintext{\blackrule[color=black, height=0.05ex, 
> width=1cm]\\Me}\blackrule[color=black, height=0.05ex, width=4cm] there 
> is no pdf after compiling.
>
> [...]
>
> <line 3.7>
>
>     \margintext{\blackrule\\{Me}}\dontleavethemode
>
> \blackrule
>
> [...]
>
> The control sequence at the end of the top line of your error message 
> was never
>
> \def'ed. You can just continue as I'll forget about whatever was 
> undefined.
>
> mtx-context | fatal error: return code: 1
>

You get a error message because you have a spelling error in the name of 
the \dontleavehmode command.

You wrote "dontleave*the*mode" but the correct name "dontleave*h*mode".

Wolfgang