open atrium groups cannot create content

Hello

I try to build an intranet for a client using Open Atrium. Everything work fine except this.

I create a group and when I try to add a section or any content to it I receive this error:

"Error
The website encountered an unexpected error. Please try again later. "

After searching I check recent logs and this is the message:

"OgException: OG membership can not be created in entity node and bundle oa_section using the field og_group_ref as the field does not reference oa_group bundle in node entity type. in OgMembership->save() (line 62 of /var/www/profiles/openatrium/modules/contrib/og/includes/og.membership.inc)."

If somebody can help I really appreciate it very much. It is urgent to deliver this job.

Thanks