Accented letters with IM FELL fonts

I am having an error compiling the following code with xelatex and lualatex:

** WARNING ** "seac" character deprecated in Type 2 charstring.** ERROR ** Type2 Charstring Parser: Parsing charstring failed: (status=-1, stack=5)

Output file removed.

\documentclass{article}\usepackage{xunicode} \usepackage{fontspec}\setmainfont[Mapping=tex-text,Ligatures={Common}, Numbers={OldStyle}]{IM FELL English PRO} \begin{document}Buongiorno a tutti. Trallallà.\end{document}

The error disappears when I omit the accented à.It also doesn't happen when I use other fonts.

Could you suggest any workaround?

Thank you,A