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How to fix undefined color in TeX LaTeX?
\\MakeUppercase (or \ppercase) does not know the semantics of arguments, it just converts all letters to uppercase: extcolor {black} {hello} becomes extcolor {BLACK} {HELLO}. \\DeclareRobustCommand protects extblack from expanding inside \\MakeUppercase to dispose and uppercase “black” in extcolor {black} again.
What does undefined color mean in xcolor error?
Package xcolor Error: Undefined color `nouncolor’. So I want to know what’s the mistake that I’m making? or, is there another way for doing this? I would really appreciate your answers, thanks! You can use \\globalcolorstrue to make the color definitions global. But I would avoid to test all the time the argument and reset colors.
Is the xcolor package an extension of the color package?
The xcolor package is an extension of the color package, so I don’t understand why you loaded the color package twice along with the xcolor package. Moreover, according to page 7 of the xcolor documentation usenames is obsolete. I cleaned up the code to this:
What to use in place of xcolor in Tex Stack Exchange?
I’ll make my comment into an answer: Try \sepackage {xcolor} in place of \sepackage {color}. xcolor.sty is a much richer, more feature-packed package. Thanks for contributing an answer to TeX – LaTeX Stack Exchange! Please be sure to answer the question.
When to use undefined when accessing uninitialized variables?
The standard clearly defines that you will receive undefined when accessing uninitialized variables, non-existing object properties, non-existing array elements, and alike. The above example demonstrates that accessing: a non-existing object property movie.year
Why are there so many undefined errors in JavaScript?
Often such risky actions generate undefined related errors: and alike type errors. JavaScript developer can understand the irony of this joke: To reduce such errors, you have to understand the cases when undefined is generated. Let’s explore undefined and its effect on code safety.