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Guide to LaTeX (4th Edition) (Tools and Techniques

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426 Appendix C. Error Messages<br />

! Missing control sequence inserted.<br />

This error is most likely caused by a \newcomm<strong>and</strong>, \renewcomm<strong>and</strong>,<br />

\newlength, or \newsavebox comm<strong>and</strong> in which the backslash \ is missing<br />

from the first argument. Pressing 〈return〉 as response will complete<br />

the processing correctly since T E X assumes a backslash is missing <strong>and</strong><br />

inserts it.<br />

! Missing number, treated as zero.<br />

This error is most likely due <strong>to</strong> a L AT E X comm<strong>and</strong> that expects a number or<br />

length as argument, which is missing. It may also occur when a comm<strong>and</strong><br />

that takes an optional argument is followed by text beginning with [.<br />

Finally another cause can be a \protect comm<strong>and</strong> preceding a length or<br />

\value comm<strong>and</strong>.<br />

! Missing { inserted.<br />

! Missing } inserted.<br />

T E X is <strong>to</strong>tally confused when either of these error indica<strong>to</strong>rs is written.<br />

The line number printed will probably not be where the source of the<br />

error is <strong>to</strong> be found, which is a missing opening or closing brace. If the<br />

error is not obvious, continue the processing by pressing 〈return〉 <strong>and</strong> try<br />

<strong>to</strong> deduce where it might be from the printed output.<br />

! Missing inserted.<br />

Most likely a symbol or comm<strong>and</strong> that may only appear in math mode<br />

was used in normal text. Recall that all those comm<strong>and</strong>s described in<br />

Chapter 5 are only allowed in math mode unless otherwise stated. If<br />

an \mbox comm<strong>and</strong> is inserted within a math formula, its argument has<br />

temporarily exited from math <strong>to</strong> normal text mode. The message may<br />

also occur if a blank line appears within a math formula, signalling a new<br />

paragraph <strong>and</strong> the end of the formula without the necessary $ sign.<br />

! Not a letter.<br />

The word list in a \hyphenation comm<strong>and</strong> contains a character that is<br />

not recognized as a letter, such as an accent comm<strong>and</strong> like \’{e}. Such<br />

words can only be hyphenated by explicitly inserting the hyphenation<br />

possibilities (Sections 2.8.1 <strong>and</strong> 2.8.2).<br />

! Paragraph ended before ... was complete.<br />

The argument of a comm<strong>and</strong> contains a blank line or a \par comm<strong>and</strong>,<br />

something that is not allowed. Probably a closing brace } has been<br />

omitted.<br />

! TeX capacity exceeded, sorry [...].<br />

T E X sets up various s<strong>to</strong>rage buffers in the computer memory <strong>to</strong> carry out

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