Add openid login in 4.7.5

In my site http://www.streetartmap.org i have donwload the module, upload in modules folder, enable in modules page and so enable the block but if i try login in home page (and the same problem in other page) the reply is "OpenID Association failed".
My setting is:
1) in settings/openid Identity
Provider policy: "Allow user to specify any Identity Provider"
Request Mode: interactive
Session Type: no-encryption
2) in settings/openid_server "Associations expire in this many seconds:3600" and Allow users to delegate their OpenID to another server is flaged
Any ideas why don't work?
many tanks