searched a lot around to fix this issue, usually it only takes a few seconds but now I have no luck. LaTeX puts out this error message mentioned above, here's my code:

\usepackage{caption, subcaption}


\caption[]{Filterkurve eines typischen Kurzpassfilters\footnotemark}

Error Message:

! Missing number, treated as zero.
l.137 \includegraphics
? X

The subfigure environment provided by subcaption has the following format

  % ...your subfigure here...

While the <pos>ition is optional, you have to specify a <width> for the subfigure. You've neglected to do that.

To fix this, add a length, for example

  % ...your subfigure here...
| improve this answer | |
  • Ah okay, Merci! But after doing this there is always a message like > Overfull \hbox (2.37161pt too wide) in paragraph at lines 137--138 or > Underfull \hbox (badness 10000) in paragraph at lines 136--147 i do not get it. – FreaxMATE Jul 31 '19 at 17:44

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