Hi ...

this ticket sums the steps to reproduce/fix issues https://jira.ez.no/browse/CS-6074 and https://jira.ez.no/browse/CS-6042
AMNH uses ezP 5.4.9.1 and the reco extension v1.0.0

https://jira.ez.no/browse/CS-6074
The customer states that the content is empty but we only receive Internal Server Errors

e.g.
GET http://www.amnh.org/api/ezp/v2/ez_recommendation/v1/content/81579?lang=eng-US&fields=short_description,image,title&image=medium
Headers:
Authorization Basic eW9vY2hvb3NlLWV6cmVjbzo/WmpnJkdUQyM4LUVBbV8n
(user: yoochoose-ezreco, pass: ?Zjg&GTC#8-EAm_')

throws

<?xml version="1.0" encoding="UTF-8"?>
<ErrorMessage media-type="application/vnd.ez.api.ErrorMessage+xml">
    <errorCode>500</errorCode>
    <errorMessage>Internal Server Error</errorMessage>
    <errorDescription>Property 'valueObject' not found on class 'eZ\Publish\Core\Repository\Values\Content\Content'</errorDescription>
</ErrorMessage>

This happened after upgrade to 5.4.9.1