Goodnight everyone.
I am trying to define new colors to use in a tcolorbox environment. Such definitions are in the preamble of the document.
When I go to use "ama" color (the last ones that I have define) it throws me the following error: "Paragraph ended before \XC@definec@lor was complete" (line 16)
What I interpret is that the definition of the color "ama" is not being read to me, since it also throws me the error "Package xcolor Error: Undefined color `ama'. ...=dark blue,colback=ama,title=Graphic I ]" in the line where I put the tcolorbox with the color (line 20)
I've been able to recreate the error with smaller code so you can see it.
I can upload an image in which the previous lines of code are marked if they consider it necessary.
I have updated the packages (and checked for updates) in MikTeX. The text editor I use is TexStudio.
\documentclass[12pt,a4paper]{article}
\usepackage[x11names]{xcolor}
\usepackage[listings,theorems,skins,most]{tcolorbox}
\usepackage{tikz}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{mathtools}
%colors defined by me
\definecolor{naranja}{RGB}{247, 159, 80}
\definecolor{azul}{HTML}{39B0FD}
\definecolor{azuloscuro}{HTML}{344D67}
\definecolor{rojito}{HTML{DC3535}
\definecolor{ama}{HTML}{F3ECB0}
\begin{document}
\begin{minipage}{0.5\textwidth}
\begin{tcolorbox}[colframe=azuloscuro,colback=ama,title=Gráfico I]
\begin{tikzpicture}
\draw [help lines,gray] (0,0) grid (8,10);
\draw [-stealth,ultra thick] (0,0) -- (0,10.3) node[above]{$y$};
\draw [-stealth,ultra thick] (0,0) -- (8.3,0) node[right]{$x$};
\foreach \y in {2,...,6}{\draw [line width=0.5mm,-stealth,yscale=0.2,domain=0:8,samples=100,red] plot (\x,{\x*\y});}
\end{tikzpicture}
\end{tcolorbox}
\end{minipage}
\quad
\begin{minipage}{0.5\textwidth}
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\[ f(x)=\begin{cases}
\sqrt{x^2-9} & \mbox{si} \ \ -9<x\leqslant-3 \\
4|x-3|-1 & \mbox{si} \ \ -3<x<4 \\
2x\mbox{sgn}(x^2-2) & \mbox{si} \ \ 5\leqslant x \leqslant 9 \\[0.2cm]
\displaystyle \frac{6x-1}{x-9} & \mbox{si} \ \ x>9 \\
\end{cases}\]
\end{minipage}
\end{document}```