Simples: Re-install the module.

It has XS dependencies which need to be recompiled because most likely your perl was upgraded / perl libraries have changed.

Give this a try: cpan -f -i Unicode::UTF8 or cpanm --reinstall Unicode::UTF8 . But that does not re-install any dependencies, so keep reinstalling if you encounter more problems till the cows come home. The best way is to re-install all modules every time your perl version changes. Typical setting : you are using linux, you installed Perl using the OS package manager. Then you installed this module using cpanm? . You or your system upgraded Perl but the module installed by you was not. Best practice: use your package manager to install Perls and modules (and it goes without saying that if you are in Linux/OSX let the system Perl alone and use perlbrew to install your own Perl and its modules.

bliako