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I know this question has been asked dozen of times, but I cannot find any with a problem like mine:

I'm working on this document, which compiled fine yesterday (I still have the old version and it is still compiling perfectly), today I added a couple of sections and a bunch of subsections, without weird commands, only plain text and \\ but when I tried to compile I got dozens of underfull \hbox errors, the first one being at line 16 (which compiled fine in the previous version of the document).

This line, specifically, is:

In linea di principio, una volta che un algoritmo è stato sviluppato, questo può essere eseguito, con risultati uguali e prevedibili tanto da un calcolatore quanto da un essere umano, con l'unica differenza che un calcolatore, a meno di errori (umani), nell'implementazione dell'algoritmo o dell'hardware su cui viene eseguito è decine di ordini di grandezza più veloce e più preciso a svolgere alcuni compiti.\\\\

that is, plain text ending with newlines.
the problem is that even after removing the newlines I still get the same error and I cannot understand what's causing it since it wasn't a problem yesterday. How am I supposed to tell TeX to start a new line without it complaining?

David Carlisle
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  • never use \\ at the end of a paragraph (or you will always get the error in the title) and never ever use \\\\ at the end of a paragraph:-) – David Carlisle Jun 12 '14 at 16:34
  • To end the paragraph use a blank line in the source. – David Carlisle Jun 12 '14 at 16:35
  • take a look at this: Implicit newline at the end of each paragraph? and also Underful hbox badness 10000 – barbara beeton Jun 12 '14 at 16:35
  • @barbarabeeton the accepted answer there is remarkably similar to my comment here:-) – David Carlisle Jun 12 '14 at 16:36
  • @DavidCarlisle -- that's why i just added a second link. – barbara beeton Jun 12 '14 at 16:38
  • @barbara beeton: thanks, I'll try later, what I cannot understand is why the file from yesterday with the very same line 16 is compiling without problems –  Jun 12 '14 at 16:38
  • Also, as I said I already tried removing the \\ at the end of line 16, but it still gives the same errors, including the one on line 16 –  Jun 12 '14 at 16:40
  • in your question, you said you added "a couple of sections and a bunch of subsections, without weird commands, only plain text and \\" so i assumed that the double backslashes weren't there when you started. – barbara beeton Jun 12 '14 at 16:40
  • @Alessandro a \\ at the end of the paragraph will always make the warning you show but you can get it for other reasons as well, if you are then please make a complete document from \documentclass to \end{document} with (just) the paragraph making the warning then someone will be able to say why the warning occurs – David Carlisle Jun 12 '14 at 16:43
  • if you leave a blank line -- or \par to indicate a paragraph break -- you will get a new line. if you don't want it indented, you can use \noindent. – barbara beeton Jun 12 '14 at 16:43
  • @Alessandro presumably it made the warnings but you did not notice. The markup you show above will always make a warning (and bad output) in latex. – David Carlisle Jun 12 '14 at 16:46
  • @DavidCarlisle: I found out the compilation was failing because I had involuntarily deleted the \end{document}, however it bugs me that the compiler is telling me that the process exited normally while there are a lot of warnings (I can see them if I look in the errors menu, but I would have expected it to alert me, that's why I didn't notice all the warnings earlier) –  Jun 12 '14 at 19:10
  • @Alessandro the warnings are printed on the terminal and in the log file, if you are not shown them you are presumably using an editor/IDE that is hiding them, if so that is a failing of the editor and not anything LaTeX can do anything about. – David Carlisle Jun 12 '14 at 19:31

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