Google+ plug in problem. Redirect uri mishmatch.

When trying to authenticate I get the following error:

Error: redirect_uri_mismatch

The redirect URI in the request: http://Languages.com/ did not match a registered redirect URI

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Request Details
scope=https://www.googleapis.com/auth/plus.me
response_type=code
redirect_uri=http://Languages.com/
access_type=offline
display=page
prompt=consent
client_id=111287788192.apps.googleusercontent.com

I had problems filling the fields in question, so I have created more than one client ID but all have the same error. How can I delete the old client id's, or, create a new one with the right data in the fields? I need the plugin to work and to post posts to my page...

Please help

Ofer