Hi, 

I am using DSpace 4.3 and trying to harvest metadata using DSpace Harvester 
via OAI-PMH from a remote repository.
The harvesting has been working before, but becaue the source repository 
changed to https it stopped.
After correcting the source link in the harvesting admin panel, I get the 
following error in the logs:

ERROR org.dspace.harvest.OAIHarvester @ Error occured while generating an 
OAI response: Root element not set null

and no new records are harvested, although the logs show that new records 
are available:

INFO  org.dspace.harvest.OAIHarvester @ Found 13 records to process

...

INFO  org.dspace.harvest.OAIHarvester @ Item document/173902(174452) has 
been ingested. The whole process took: 16 ms. 

...

INFO  org.dspace.discovery.SolrServiceImpl @ Wrote Item: document/173902 to 
Index

...

Any idea?

Regards,
John

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