hyperref: Token not allowed in a PDF string (PDFDocEncoding): sample.tex

documentclass[xcolor=pdftex,dvipsnames,table]{beamer}
usepackage{hyperref} % Url Links
usepackage{lmodern}% http://ctan.org/pkg/lm (For special Fonts)

author[First Last Name]{Date: today} % (optional, for multiple authors)

begin{document}
  titlepage
end{document}