Do you have Products.CMFDefault installed? or plone.app.ldap, which depends on CMFDefault?
Also see Upgraded site from 5.0.8 to 5.1 and now I can't add content
Do you have Products.CMFDefault installed? or plone.app.ldap, which depends on CMFDefault?
Also see Upgraded site from 5.0.8 to 5.1 and now I can't add content