Recreate my error:
enable Message, Message_example, Message_notify, message_notify_example, and message_og_example, also required modules: strongarm, token and features, then I try to create a comment and got this error:

EntityMetadataWrapperException: Unable to get the data property format as the parent data structure is not set. in EntityStructureWrapper->getPropertyValue() (line 442 of /Users/fmilland/Documents/sitiosweb/og/sites/all/modules/entity/includes/entity.wrapper.inc)

Ive found that without enabling the example modules, I can post comments, any ideas?

Thanks for your help.

Comments

Same here.
After investigation the module that triggle the error is message_notify_example (message_og_example is fine).

Can you check to make sure the additional fields (field_node_ref, field_published, and the message fields for notify) on the message are created? Features is not always reliable at importing them. (You can create them yourself as long as the machine names match.)

Also - which version of features you'r using.

Issue summary:View changes

Error message, incomplete.

Issue summary:View changes

same issue here

This is likely fixed in the dev version. See #2108283: Entity language info missing.