TransformError: Error during transformation after upgrade from Plone 5.1.1 to 5.1.4

[pigeonflight (David Bain (Will Theme Plone Sites))]

@Rotonen,
Thanks for pointing out the core issue, documented in this thread:

Products.PortalTransforms.data.datastream.getData() changes?

The quick fix is to change collective.cover's code here: searchable_text = data.getData() if isinstance(searchable_text, six.binary_type): searchable_text = searchable_text.decode('utf-8') or from Products.CMFPlone.utils import safe_unicode return safe_unicode(data.getData()) Unluckily the output of convertTo has changed in a non retrocompatible way in a minor release and nobody noticed this. Apparently convertTo should return a str object in both Python 2 and 3. That is very bad a…

Since it is introduced with a new version of Products.PortalTransforms, I pinned the old version in my buildout versions and now everything works again.

Products.PortalTransforms = 3.1.2 works for me.