Ever had the problem in Perl:
Undefined subroutine &Scalar::Util::weaken called at
This is caused by a version of Scalar::Util that is perl only and doesn’t implement the weaken function (ref). To install the XS version of Scalar::Util use cpan and run:
force install Scalar::Util
You rock! I’ve hit this problem and had trouble figuring out what CPAN magic elf was sick. Thanks!