OAI-PMH Harvester

I would like you help me to set the URL base of our OAI PMH Harvester. I wrote http://www.bnci.ci/akwaba/admin/oaipmh-harvester and noticed that there were messages written as below:

Error in parsing response XML. XML document had the following errors:
Opening and ending tag mismatch: link line 11 and head on line 33, column 12

How to the URL Base very well