I am getting the following error with the example given at the end:
Option clash for package xcolor.
Example:
\documentclass{beamer}
\usetheme{Warsaw}
\usepackage{amsmath,amsfonts,amssymb,pxfonts,eulervm,xspace}
\usepackage{graphicx}
\usecolortheme{dolphin}
\usepackage[usenames,dvipsnames,svgnames,table]{xcolor}
\useinnertheme{circles}
\useoutertheme{smoothbars}
\usepackage{geometry}
\oddsidemargin = -2cm
\usepackage{pdfpages}
\setcounter{framenumber}{-1}
\usepackage{tcolorbox}
\usepackage[spanish, es-tabla]{babel}
\usepackage[utf8]{inputenc}
\begin{document}
contenidos...
\end{document}