If you followed a link to this article, chances are some well-intentioned editor of this wiki used the template, {{Lcmd}} but forgot to say what command he was referring to. The syntax of references to LaTeX commands is {{Lcmd}} So here's what you should do: go back to the [/index.php?title=Special%3AWhatLinksHere&target=No_such_(LaTeX_command)&namespace= article that links here] and then edit that article (but not the Lcmd template itself, please) to correct the syntax of the reference to the {{Lcmd}} template. Thanks!