Tabulary - missing number - treated as zero

I do understand where the error is about the missing number: Missing number, treated as zero. \end{tabulary}

\documentclass[a4paper,11pt]{article} \usepackage{hyperref} \usepackage{fontspec} \usepackage[english, ngerman]{babel} \usepackage{soul} % for strikethrought \usepackage{xcolor} % for highlighting \usepackage{booktabs} % for rules within a table \usepackage{tabulary} % for tables with long lines \begin{document} \subsection{Basic HTML Table} \begin{table}[ht] \centering \begin{tabulary}{\linewidth}{ C C C } \toprule \textbf{Firstname} & \textbf{Lastname} & \textbf{Age} \\ \midrule Jill & Smith & 50 \\ \midrule Eve & Jackson & 94 \\ \midrule John & Doe & 80 \\ \midrule \bottomrule \end{tabulary} \end{table} %second table Table with mulitple cols \hl{in the header}: \begin{table}[ht] \centering \begin{tabulary}{\linewidth}{ C C C } \toprule \textbf{Name} & \multicolumn{2}{ C }{\textbf{Telephone}} \\ \midrule Bill Gates & 55577854 & 55577855 \\ \midrule \bottomrule \end{tabulary} \end{table} \end{document} 

Any idea? And if I drop the first table the whole thing gets even worse cause it reports Undefined control sequence. \end{tabulary}