Can't export content with versions in Plone 5.0

[JeffersonBledsoe]

Trying to export with revisions in Plone5.0 results in the following exception:

Traceback (most recent call last):
  File "/buildout/plone/instance/buildout-cache/eggs/collective.exportimport-1.7.dev0+155870989426123572981149019563996627444-py2.7.egg/collective/exportimport/export_content.py", line 303, in export_content
    item = self.update_export_data(item, obj)
  File "/buildout/plone/instance/buildout-cache/eggs/collective.exportimport-1.7.dev0+155870989426123572981149019563996627444-py2.7.egg/collective/exportimport/export_content.py", line 347, in update_export_data
    item = self.export_revisions(item, obj)
  File "/buildout/plone/instance/buildout-cache/eggs/collective.exportimport-1.7.dev0+155870989426123572981149019563996627444-py2.7.egg/collective/exportimport/export_content.py", line 503, in export_revisions
    item_version = serializer(include_items=False, version=version_id)
TypeError: __call__() got an unexpected keyword argument 'version'

This occurs here:

collective.exportimport/src/collective/exportimport/export_content.py

Line 510 in a810deb

item_version = serializer(include_items=False, version=version_id)

[mauritsvanrees]

That version seems to be supported since plone.restapi 1.0.0 already, but maybe not in all possible serialisers.
Can you check what serializer is here?
What portal_type is the item/object for? Maybe its serializer cannot handle this.