[Koha] Strange SAX error when searching

[Sophat Sam]

Hi,

Recently I have been getting this error when I search with certain
terms from the staff client as well as the OPAC. Don't know why. Any
ideas?

Error:
Field 500 must have at least one subfield at
/usr/local/lib/perl5/site_perl/5.8.9/MARC/File/SAX.pm line 60

Running Koha 3.01.00.037 with Perl version 5.008009.
Other related modules and version numbers:
MARC::Charset 0.98 MARC::Crosswalk::DublinCore 0.02 MARC::File::XML
0.88 MARC::Record 2.0.0
XML::Dumper 0.81 XML::LibXML 1.59 XML::LibXSLT 1.59 XML::RSS 1.32

I've installed most of these modules manually, without CPAN and made
sure they all installed correctly.
Everything had been working perfectly until I upgraded Koha (from 3.0
to below) and Perl (from 5.8.8 to 5.8.9).

Best