The memoir class - The UK TeX Archive

F. THE TERRORS OF ERRORSTwo \documentclass commandsYour document has two \documentclass commands; only one is permitted.Two \LoadClass commandsThis is an error in the class file. Complain to the author.Undefined tab positionA \>, \+, \-, or \< tabbing command is trying to move to a tab position that has notbeen defined by a \= command.Unknown option ... for class/package ...You have asked for an option that the class or package does not know about. Perhapsyou have mispelled something, or omitted a comma.\usepackage before \documentclassIn general, the \usepackage command can only be used in the preamble.\verb ended by end of lineThe argument of a \verb command runs past the end of the line. Perhaps you forgotto put in the correct ending character.\verb illegal in command argumentA \verb cannot be part of the argument to another command.F.3 LATEX WARNINGSMost warnings are given at the point in the document where a potential problem is discovered,while others are output after the document has been processed.For example, the following code... \ref{joe}... \cite{FRED96} ...may produce warnings likeLatex Warning: Reference ‘joe’ on page 12 undefinedon input line 881.Latex Warning: Citation ‘FRED96’ on page 12 undefinedat lines 890--897.during the document processing, and then at the end there will also be the warning:LaTeX Warning: There were undefined references.Some warning messages pinpoint where a problem might lie, as in the citation warningabove, while others make no attempt to do so. In the alphabetical listing that follows I havenot included such information, even if it is supplied.Citation ... on page ... undefinedThe key in a \cite command was not defined by any \bibitem.462