MediaWiki:Userinvalidconfigtitle
Warning: There is no skin "$1". Custom .css, .json, and .js pages use a lowercase title, e.g. User:Foo/vector.css as opposed to User:Foo/Vector.css.
A vector is a set of three scalars, normally representing X, Y and Z coordinates. It also commonly represents rotation, where the values are pitch, heading and bank.
