& Lunedì & Martedì & Mercoledì & Giovedì & Venerdì \\
8-9 & & & (8.30) P (CP) & & \\
9-10 & P (GD) & & P (CP) & & \\    
10-11 & P (GD) & D (FC) & P (CP) & & D (FC) \\
11-12 & & D (FC) & F, S, D (MS) & & P (GD), D (FC) \\  
12-13 & & D (FC) & F, S, D (MS) & & P (GD), D (FC) \\
13-14 & & & & & \\
14-15 & P (CP), F (PS) & & F (PS) & & F, S, D (MS) \\
15-16 & P (CP), F (PS) & & F (PS) & & F, S, D (MS) \\
16-17 & & D (RO) & & D (RO) & \\
17-18 & & D (RO) & & D (RO) & \\


I'm getting this error

! Misplaced \noalign.
\hline ->\noalign 
                  {\ifnum 0=`}\fi \hrule \@height \arrayrulewidth \futurelet...

I've been looking for similar questions for days, but none of the ones I've found solve my problem

  • 2
    The culprit is \ensuremath. Why did you use it?
    – Bernard
    Sep 28 '19 at 19:16
  • Without \ensuremath, I get ! Missing $ inserted. <inserted text> $
    – ygh
    Sep 28 '19 at 19:36
  • 1
    With this very code???
    – Bernard
    Sep 28 '19 at 19:37
  • @Bernard: I can confirm this. The error seems to be caused by the ì in combination with the \usepackage[latin1]{inputenc} and pdflatex. Commenting out said package (and of course \ensuremath) the code works perfectly fine (but yields and overfull box warning due to the table being too wide).
    – leandriis
    Sep 28 '19 at 19:40
  • It seems so. I found some question about "! Missing $ inserted" solved with \ensuremath and so i put it in my code. It worked, I hope it is not really the cause of the new problem
    – ygh
    Sep 28 '19 at 19:41

Just for the fun of it, let's see what happens (bullets denote a space in the macro name).

  1. \ensuremath expands to \protect\ensuremath•
  2. \protect is \relax in this context, so it disappears
  3. \ensuremath• expands to \ifmmode\expandafter\@firstofone\else\expandafter \@ensuredmath\fi
  4. Since we're not in math mode, \expandafter\@ensuredmath\fi remains
  5. \expandafter removes the \fi and \@ensuredmath remains

The definition of \@ensuredmath is

% latex.ltx, line 4666:

What's taken as argument of \@ensuredmath? No brace follows, the next token is \begin, we get


Now LaTeX happily proceeds, because there is a macro \$. A long series of errors follows, but if you skip them all, you'll see that LaTeX typesets

enter image description here

where the $ symbol is clearly visible, generated by the \$ produced by \begin$. No tabular environment is started, so \hline is completely out of place (the shown error is indeed Misplaced \noalign as you can check by a simple document such as


No, adding \ensuremath if an error Missing $ inserted pops up is generally the wrong thing to do. Take as general rule that \ensuremath should never be used in the document environment; it has its uses in command definitions.

The error Missing $ inserted should be taken care of by looking where math mode is wrongly started or unfinished.

If I remove the wrong \ensuremath, the example document compiles well when encoded as Latin-1.

If I encode it as UTF-8, then the Missing $ inserted error pops up.

Solution: your document is UTF-8 encoded, so change \usepackage[latin1]{inputenc} into


(or remove the call altogether if you're using an up-to-date TeX distribution).

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