Error in validation at BASE OAI-PMH Validator

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Validating OAI at BASE OAI-PMH Validator ( gives the error below:

ERROR: ListRecords response well-formed but invalid: Element ‘{}identifier’, attribute ‘{}type’: The QName value ‘{}DOI’ of the xsi:type attribute does not resolve to a type definition.

I don’t know how to solve it. The error will be removed if I remove entries like:

<dc:identifier xsi:type=“dcterms:DOI”>10.22067/jrrp.v1i1.14646</dc:identifier>

from OAI output, but manager of journals want doi in output.

Thank you in advance.