I get this error in Eclipse:
The OakConstraint would seem perhaps to indicate a violation of DAM Metadata Schema.
So while investigating I noticed PNG is not listed in /etc/dam/metadataeditor/mimetypemappings.
Does something need to be added in order to remove the Oak constraint violation?
Can you post a screenshot of the properties of the node /content/dam/pcwr/sprint-8-demo/top-nav-logo.png/jcr:content/renditions/cq5dam.thumbnail.140.100.png/jcr:content ?
It was created automatically behind the scenes by AEM, probably the OOTB workflow that runs after an image is uploaded through the DAM UI. It's possible the node became corrupted as a result of this other issue: Re: Eclipse "Import from Server..." function corrupts the JCR
Is there a quick way to re-run the image upload workflows or somehow reset/overwrite these bad nodes?