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I am using overleaf and I got the following message:

  • "Underfull \vbox (badness 4543) has occurred while \output is active []"

I have no idea of what does it mean. It appears in the log after a figure:

Log output where the message appears:

File: figures/logo-etsit2.png Graphic file (type png) <use figures/logo-etsit2.png> Package pdftex.def Info: figures/logo-etsit2.png used on input line 325. (pdftex.def) Requested size: 36.67815pt x 56.9055pt. [5pdfTeX warning (ext4): destination with the same identifier (name{figure.2}) has been already used, duplicate ignored

\AtBegShi@Output ...ipout \box \AtBeginShipoutBox \fi \fi l.325 \end{enumerate} </compile/figures/t.png> </compile/figures/TvsN.png>] <figures/chi.JPG, id=167, 732.48656pt x 376.40625pt> File: figures/chi.JPG Graphic file (type jpg) <use figures/chi.JPG> Package pdftex.def Info: figures/chi.JPG used on input line 360. (pdftex.def) Requested size: 366.24237pt x 188.20265pt.

Underfull \vbox (badness 4543) has occurred while \output is active []

File: figures/logo-etsit2.png Graphic file (type png) <use figures/logo-etsit2.png> Package pdftex.def Info: figures/logo-etsit2.png used on input line 364. (pdftex.def) Requested size: 36.67815pt x 56.9055pt. [6]

I don't know if it is related to the following problem I see in the output pdf:

enter image description here

The spaces between each item are too big. If I write the same text in previous sections, where spaces are normal I get: enter image description here

No other error I got than the previous message so I don't know if it is related with. I think not only items space are too big but also for equation environment.

  • Welcome to TeX.SE? How we can reproduce your problem? Please, provide a example of small complete document, which reproduce this warning. This warning only means that formatting of your document is not optimal ... – Zarko Oct 19 at 11:42
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    the message means that there is not enough text to fill the page, so LaTeX stretches the spaces. In general this happens because of some large object like a graphic or a tabular that can't float away and so has to go to the next page. – Ulrike Fischer Oct 19 at 11:50
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By casuality I found the solution:

In the figure position options, I changed [H] by [!ht] and the error disappeared and spacing is again correct.

Thanks!


\begin{figure}[!ht] \centering \includegraphics[scale=0.5]{figures/chi.JPG} \caption{Chi-square} \label{fig:chi} \end{figure}

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