In OJS 2.4.8 in file /lib/pkp/classes/oai/OAI.inc.php lines 306 to 308 a site is defined as toolkit, but that site is down since more than a year (VTOAI Perl Data Provider).
Could you confirm the VTOAI Perl Data Provider site is up and running again?
I was checking on this post since I am experiencing problems at having my OJS data parsed by Worldcat through an OAI request. Wolrdcat support pinpointed the “toolkit” schema as being problematic. But that was before your post. And now I’m checking on the provided link, all seems fine… is it?
I cannot tell by myself, since I did not visit the link at the time site was down…