Unknown data property og_membership in EntityStructureWrapper->getPropertyInfo()

I'll need more info to be able to reproduce.

Just to make sure -- you are using the stable 1.3 as indicated in the version?

I'm getting the same error.

The error occures when i'm editing a node (as admin) that is authored by another user. When i change the author to admin, everything works.

I get the same error when I try to create the first group node and determinig an existing node as a group also.

I've noticed that it could be a problem with "Universally Unique ID" module. If I uninstall that module, everithing works fine.

Oddly enough unistalling UUID worked for me as well.

I am getting this error but do not have the UUID module installed.

I can also confirm this error. I had the Deploy module installed and got the same error, then backed out that installation all the way through UUID, after which it was finally resolved.

Upgrading to the dev version of UUID fixed it for me.

I encounter the same issue, disabling UUID fixed it for me too.

WOW, suffering from this too, and it looks like some hook_property_info_alter() is really f***ed up.

$info = module_invoke_all('entity_property_info');
dsm($info);
// this looks fine
drupal_alter('entity_property_info', $info);
dsm($info);
// this is totally damaged, 

so checking

dsm(module_implements('entity_property_info_alter'));
// entity uuid

and yes, UUID is the offending guy:

$info = module_invoke_all('entity_property_info');
dsm($info);
// OK
entity_entity_property_info_alter($info);
dsm($info);
// OK
uuid_entity_property_info_alter($info);
dsm($info);
// damaged

which is no wonder due to this line in current stable release uuid-7.x-1.0-alpha3: (look at $info)

function uuid_entity_property_info_alter(&$info) {
  foreach (entity_get_info() as $entity_type => $info) {

this is fixed in current UUID dev, so made issue #1663390: Roll a new UUID stable release

I'm having the same issue when I try to create a bunch of test users with the dev tool... assigning a Profile2 related role to each group.

Same error with message module.

Yes, with the message module, the simple fix to this error message is to disable "Message OG example" module. I don't use any of the example modules anyway; not sure what folks use them for but so far, they've done me more harm than good. :)

OG example is disabled and still having the same issue.

Experiencing this problem with Entity API 7x-1 and OG 7x-2.1. Posted problem here:

http://drupal.org/node/1519884#comment-7236252

I was experiencing a similar problem, and it ended up being a result of improperly including js and css files in a custom module.

Even the 7.x-2.2 version is capable of producing this error.

EntityMetadataWrapperException: Unknown data property group_group. in EntityStructureWrapper->getPropertyInfo() (line 339 of ../sites/drupal-7.22/sites/all/modules/entity/includes/entity.wrapper.inc).

This happens after changing the group machine name before clearing cache.

#20 was my issue - everything seems fine now after flushing the cache. (I had altered machine name)